A: Energy Used for

Cooking Purpose

Devices Used Wattage Rating

(1)

1. Oven 2000
2. Grill
3. Hotplate
4. Toaster 800
5. Electric 1500
Kettle
6. Others

B: Energy Used in
Lighting

Devices Used Wattage Rating

(1)

Bulb: 5W 5
15W 15
25W
40W
60W 50
100/200W
Tubes:
40w
36w 36
20w 20
11w
Any
Other
 C: Energy Used for
Cooling Purpose

Devices Used Wattage Rating

(1)

40W 75
FAN 75/120W 75
60W
115W
Air Coolers:
186.5W 120
373/746W
1000W 579
Air Conditioner:
1500W
2000W

D: Energy Used for

Heating Purpose

Devices Used Wattage Rating

(1)

RoomHeater/ 500W
Convector: 1000W
1500 W
2000/3000W
Any Other

E: Energy Used in
Helpmates and Other
Devices
 Devices Used Wattage Rating

(1)

Refrigerator 250
Blender/Juicer
Geyser 3000
Electric Iron 1000
Water Pump
Vacuum
Cleaner
Battery
Inverter 250
Others

F: Energy Used for

Entertainment
Purpose

Devices Used Wattage Rating

(1)

Dish Antenna with

6
Receiver
TV: 120
DVD
Radio/Transistor
5
Wifi Router, etc

Others: Music system 1000

G: Summary of the
Energy Consumption
Data (A to F)
 Energy Use Area

A: Cooking
B: Lighting
C: Cooling
D: Heating
E: Helpmates and
other Devices
F: Entertainment

Rank
1️⃣
2️⃣
3️⃣
4️⃣
5️⃣
6️⃣
 Rate 6

Estimated
No. of Estimated
Daily
Appliances Total Wattage Daily
Consumption
Used Hours of Use
(KWh)

(2) (3)=(2)x(1) (4) (5)=(3)x(4)

1 2000 0.5 1

1 800 0.2 0.16

1 1500 0.2 0.3

Estimated
No. of Estimated
Daily
Appliances Total Wattage Daily
Consumption
Used Hours of Use
(KWh)

(2) (3)=(2)x(1) (4) (5)=(3)x(4)

2 10 6 0.06
3 45 5 0.225

1 50 1 0.05

3 108 5 0.54
1 20 5 0.1
 Estimated
No. of Estimated
Daily
Appliances Total Wattage Daily
Consumption
Used Hours of Use
(KWh)

(2) (3)=(2)x(1) (4) (5)=(3)x(4)

2 150 12 1.8
1 75 3 0.225
0 0

1 120 2 0.24
0 0
1 579 4 2.316

Estimated
No. of Estimated
Daily
Appliances Total Wattage Daily
Consumption
Used Hours of Use
(KWh)

(2) (3)=(2)x(1) (4) (5)=(3)x(4)

 Estimated
No. of Estimated
Daily
Appliances Total Wattage Daily
Consumption
Used Hours of Use
(KWh)

(2) (3)=(2)x(1) (4) (5)=(3)x(4)

1 250 24 6

1 3000 0.5 1.5

1 1000 0.5 0.5

1 250 2 0.5

Estimated
No. of Estimated
Daily
Appliances Total Wattage Daily
Consumption
Used Hours of Use
(KWh)

(2) (3)=(2)x(1) (4) (5)=(3)x(4)

1 6 6 0.036
1 120 6 0.72

1 5 24 0.12

1 1000 2 2
 Look for Energy
Units Arrange in
% Consumption Conservation
Consumed Maximum to
(1) x 100/Total Opportunities in
(1) Minimum
the same order

43.8 8.61
13.05 2.57
110.43 21.71
0 -
255 50.14
86.28 16.97
508.56 100.00

Energy Conservation Opportunities (Suggestions)

Energy Use AreaUnits Consumed
To save energy, focus on areas with higher consumption first:
E: Helpmate 255 devices when not in use.
Unplug
C: Cooling Use energy-efficient
Set AC110.43 appliances
temperature (e.g., inverter-based
to 24–26°C for efficiency.devices).
Use
Turn off TVs, gaming
F: Entertai fans insteadand
consoles,
86.28 of AC when
sound possible.
systems when not in use.
A: Cooking Use LED
43.8screens instead of plasma TVs.
Use pressure cookers and induction cooktops for efficiency.
B: Lighting 13.05incandescent bulbs with LEDs.
Replace
D: Heating Use natural
0 light during the daytime.
 Rs/Kwh

Estimated Monthly
Estimated
Monthly Energy Units Cons
Days in a
Consumption Cost umed
Month
(KWh/month) (Rs.)
(8)=(7)x Unit
(6) (7)=(5)x(6) Price
(Rs/KWh)
30 30 180 30

30 4.8 28.8 4.8

30 9 54 9

43.8

Estimated Monthly
Estimated
Monthly Energy
Days in a
Consumption Cost
Month
(KWh/month) (Rs.)

(8)=(7)x Unit
(6) (7)=(5)x(6) Price
(Rs/KWh)
30 1.8 10.8 0.9
30 6.75 40.5 2.25
0
0
30 1.5 9 1.5
0
0
0
30 16.2 97.2 5.4
30 3 18 3
0
0
0
13.05
 Estimated Monthly
Estimated
Monthly Energy
Days in a
Consumption Cost
Month
(KWh/month) (Rs.)

(8)=(7)x Unit
(6) (7)=(5)x(6) Price
(Rs/KWh)
30 54 324 27
30 6.75 40.5 6.75
30 0 0 0
0
30 7.2 43.2 7.2
30 0 0 0
30 69.48 416.88 69.48
0
0
110.43

Estimated Monthly
Estimated
Monthly Energy
Days in a
Consumption Cost
Month
(KWh/month) (Rs.)

(8)=(7)x Unit
(6) (7)=(5)x(6) Price
(Rs/KWh)
0
0
0
0
0
0
 Estimated Monthly
Estimated
Monthly Energy
Days in a
Consumption Cost
Month
(KWh/month) (Rs.)

(8)=(7)x Unit
(6) (7)=(5)x(6) Price
(Rs/KWh)
30 180 1080 180
0
30 45 270 45
30 15 90 15
0
0
0
0
30 15 90 15
0
255

Estimated Monthly
Estimated
Monthly Energy
Days in a
Consumption Cost
Month
(KWh/month) (Rs.)

(8)=(7)x Unit
(6) (7)=(5)x(6) Price
(Rs/KWh)

30 1.08 6.48 1.08

30 21.6 129.6 21.6
0
30 3.6 21.6 3.6

30 60 360 60
86.28
A: Energy Used for
Cooking Purpose

Devices Used

1. Oven
2. Grill
3. Hotplate
4. Toaster
5. Electric
Kettle
6. Others - Mixer

B: Energy Used in
Lighting

Devices Used

Bulb: 5W
15W
25W
40W
60W
100/200W
Tubes:
40w
36w
20w
11w
Any
Other
 C: Energy Used for
Cooling Purpose

Devices Used

40W
FAN 75/120W
60W
115W
Air Coolers:
186.5W
373/746W
1000W
Air Conditioner:
1500W
2000W

D: Energy Used for

Heating Purpose

Devices Used

RoomHeater/ 500W
Convector: 1000W
1500 W
2000/3000W
Any Other

E: Energy Used in
Helpmates and Other
Devices
 Devices Used

Refrigerator
Blender/Juicer
Geyser
Electric Iron
Water Pump
Vacuum
Cleaner
Battery
Inverter
Others

F: Energy Used for

Entertainment
Purpose

Devices Used

Dish Antenna with

Receiver
TV:
DVD
Radio/Transistor
Wifi Router, Mobile
charger etc

Others: Music system

G: Summary of the
Energy Consumption
Data (A to F)
 Activity 4:
Identification of Good
Housekeeping
Measures: 5 Marks

Identify good
housekeeping
measures in order of
preference
Wattage Rating

(1)

2000

800
1500

1000

Wattage Rating

(1)

5
15

20
Wattage Rating

(1)

75

120

579

Wattage Rating

(1)
Wattage Rating

(1)

250
1000
3000
1000

250

Wattage Rating

(1)

6
120

10

1000
 Energy Use Area

A: Cooking
B: Lighting
C: Cooling
D: Heating
E: Helpmates and other Devices
F: Entertainment

Rank
1️⃣
3️⃣
4️⃣
2️⃣
5️⃣
6️⃣

Turn off unused appliances.

Use energy-efficient LED or CFL lights.
Optimize cooling and heating usage (set AC to 24-26°C, use fans).
Reduce standby power by unplugging devices.
Use energy-efficient, star-rated appliances.
Optimize refrigerator usage (minimize door opening, proper ventilation).
Use smart power strips to cut phantom loads.
Maintain electrical equipment (clean filters, check wiring).
Utilize natural daylight to reduce artificial lighting.
Schedule high-power appliance usage during non-peak hours.
 Rate

Estimated
No. of
Total Wattage Daily
Appliances Used
Hours of Use

(2) (3)=(2)x(1) (4)

1 2000 0.5

1 800 0.2
1 1500 0.2

1 1000 0.5

Estimated
No. of
Total Wattage Daily
Appliances Used
Hours of Use

(2) (3)=(2)x(1) (4)

2 10 4.5
3 45 3.5

1 20 3
 Estimated
No. of
Total Wattage Daily
Appliances Used
Hours of Use

(2) (3)=(2)x(1) (4)

3 225 5

1 120 2

1 579 2

Estimated
No. of
Total Wattage Daily
Appliances Used
Hours of Use

(2) (3)=(2)x(1) (4)

 Estimated
No. of
Total Wattage Daily
Appliances Used
Hours of Use

(2) (3)=(2)x(1) (4)

1 250 24
1 1000 0.5
1 3000 0.5
1 1000 0.5

1 250 0.5

Estimated
No. of
Total Wattage Daily
Appliances Used
Hours of Use

(2) (3)=(2)x(1) (4)

1 6 6
1 120 6

1 10 24

1 1000 2
 Arrange in
Units Consumed % Consumption
Maximum to
(1) (1) x 100/Total
Minimum

58.8 11.98
7.875 1.60
75.69 15.42
0 -
258.75 52.70
89.88 18.31
490.995 100.00

Energy Conservation Opportunities (Suggestio

Energy Use Area Units Consumed
To save energy, focus on areas with higher con
E: Helpmates and Other Device 258.75 Unplug devices when not in use.
F: Entertainment Use energy-efficient
89.88 Turn off TVs, gamingappliances (e.g.,
consoles, and inverter-
sound syst
A: Cooking 58.8 Use LED screens instead of plasma TVs.
Use pressure cookers and induction cooktops f
C: Cooling 75.69 Set AC temperature to 24–26°C for efficiency.
B: Lighting Use fansincandescent
7.875 Replace instead of ACbulbs
whenwith
possible.
LEDs.
D: Heating 0 Use natural light during the daytime.
TRUE
 6 Rs/Kwh

Estimated Estimated Monthly

Estimated
Daily Monthly Energy
Days in a
Consumption Consumption Cost
Month
(KWh) (KWh/month) (Rs.)

(8)=(7)x Unit Price

(5)=(3)x(4) (6) (7)=(5)x(6)
(Rs/KWh)

1 30 30 180

0.16 30 4.8 28.8

0.3 30 9 54

0.5 30 15 90

Estimated Estimated Monthly

Estimated
Daily Monthly Energy
Days in a
Consumption Consumption Cost
Month
(KWh) (KWh/month) (Rs.)

(8)=(7)x Unit Price

(5)=(3)x(4) (6) (7)=(5)x(6)
(Rs/KWh)

0.045 30 1.35 8.1

0.1575 30 4.725 28.35

0.06 30 1.8 10.8

 Estimated Estimated Monthly
Estimated
Daily Monthly Energy
Days in a
Consumption Consumption Cost
Month
(KWh) (KWh/month) (Rs.)

(8)=(7)x Unit Price

(5)=(3)x(4) (6) (7)=(5)x(6)
(Rs/KWh)

1.125 30 33.75 202.5

0.24 30 7.2 43.2

1.158 30 34.74 208.44

Estimated Estimated Monthly

Estimated
Daily Monthly Energy
Days in a
Consumption Consumption Cost
Month
(KWh) (KWh/month) (Rs.)

(8)=(7)x Unit Price

(5)=(3)x(4) (6) (7)=(5)x(6)
(Rs/KWh)
 Estimated Estimated Monthly
Estimated
Daily Monthly Energy
Days in a
Consumption Consumption Cost
Month
(KWh) (KWh/month) (Rs.)

(8)=(7)x Unit Price

(5)=(3)x(4) (6) (7)=(5)x(6)
(Rs/KWh)

6 30 180 1080
0.5 30 15 90
1.5 30 45 270
0.5 30 15 90

0.125 30 3.75 22.5

258.75 1552.5

Estimated Estimated Monthly

Estimated
Daily Monthly Energy
Days in a
Consumption Consumption Cost
Month
(KWh) (KWh/month) (Rs.)

(8)=(7)x Unit Price

(5)=(3)x(4) (6) (7)=(5)x(6)
(Rs/KWh)

0.036 30 1.08 6.48

0.72 30 21.6 129.6

0.24 30 7.2 43.2

2 30 60 360
 Look for Energy
Conservation
Opportunities in
the same order

servation Opportunities (Suggestions)

rgy, focus on areas with higher consumption first:
ces when not in use.
,efficient
gamingappliances (e.g.,
consoles, and inverter-based
sound devices).
systems when not in use.
eens instead of plasma TVs.
e cookers and induction cooktops for efficiency.
perature to 24–26°C for efficiency.
tead of ACbulbs
andescent whenwith
possible.
LEDs.
light during the daytime.
Units Cons
umed

30
0
0
4.8
9
0
15
58.8

1.35
4.725
0
0
0
0
0
0
0
1.8
0
0
0
7.875
 0
33.75
0
0
7.2
0
34.74
0
0
75.69

0
0
0
0
0
0
 180
15
45
15
0
0
0
0
3.75
0
258.75

1.08
21.6
0

7.2

60
89.88
Activity 3 Electricity Consumption Data for Various Activities: 10 Marks

Sr.No. Name of the Place

1 Room 1 1
Master bedroom 2
3
4
5
6
7
8
x
2 Room 2 1
2
Study room 3
4
5
6
7
8
9
x
x
3 Drawing Room 1
2
3
4
5
6
7
8
x
3 Kitchen 1
2
3
4
4 Veranda 1
2
5 Bathroom 1
2
Total Energy Consumed
for Various Activities: 10 Marks

Nature of Load Wattage (W) Daily Hrs of use KWh

Bulb 15 3 0.045
48" Fan 75 7 0.525
Electric Iron 1000 0.5 0.5
Air Cooler 120 2 0.24
Battery Inverter 250 0.5 0.125
TV 120 3 0.36
Room Heater 0 0 0
Any Other 0 0 0
Sub Total 1580 16 1.795
Tube 20 3 0.06
Bulb 15 4 0.06
TV 0 0 0
Refrigerator 0 0 0
Air Conditioner 579 2 1.158
Room Cooler 0 0 0
Music System 1000 2 2
Room Heater 0 0 0
Fan 75 4 0.3
Any Other - Computer 250 1 0.25
Sub Total 1939 16 3.828
Bulb 15 3 0.045
Tube 0 0 0
56" Fan 75 4 0.3
Air Cooler 0 0 0
Room Heater 0 0 0
Water Pump 0 0 0
Refrigerator 250 24 6
Any Other - WIFI ROUTER, MOBILE CHARGEING 10 24 0.24
Sub Total 350 55 6.585
Bulb 5 8 0.04
Tube 0 0 0
Heater/Cooker 0 0 0
Mixer 1000 0.5 0.5
Bulb 5 1 0.005
Tube 0 0 0
Bulb 5 1 0.005
Geyser 3000 0.5 1.5
7884 98 14.258
Category
B: Energy Used in Lighting
C: Energy Used for Cooling Purpose
E: Energy Used in Helpmates and Other Devices
C: Energy Used for Cooling Purpose
E: Energy Used in Helpmates and Other Devices
F: Energy Used for Entertainment Purpose
D: Energy Used for Heating Purpose

B: Energy Used in Lighting

B: Energy Used in Lighting
F: Energy Used for Entertainment Purpose
E: Energy Used in Helpmates and Other Devices
C: Energy Used for Cooling Purpose
C: Energy Used for Cooling Purpose
F: Energy Used for Entertainment Purpose
D: Energy Used for Heating Purpose
C: Energy Used for Cooling Purpose

B: Energy Used in Lighting

B: Energy Used in Lighting
C: Energy Used for Cooling Purpose
C: Energy Used for Cooling Purpose
D: Energy Used for Heating Purpose
E: Energy Used in Helpmates and Other Devices
E: Energy Used in Helpmates and Other Devices
F: Energy Used for Entertainment Purpose

B: Energy Used in Lighting

B: Energy Used in Lighting
D: Energy Used for Heating Purpose
E: Energy Used in Helpmates and Other Devices
B: Energy Used in Lighting
B: Energy Used in Lighting
B: Energy Used in Lighting
E: Energy Used in Helpmates and Other Devices
 Activity 5 Energy Conservation Measures in Light
Activity: (a) Estimate the hours of light use when there is n
shown in Table 5.1.

Nature of Load

Bulb 1
Bulb 2
Bulb 3
Tube Light
Any Other
Total Energy
Consumed While
Idle Running

Total Cost of Energy

Activity: (b) Use bulbs with lower wattage in halls, stair ways, a
illumination. Estimate the energy saved as shown

Existing Wattage
(W)

100

60

40

36 (Tube Light)
Any Other

**Total Energy
Saved**

**Total Cost of
Energy Saved**

Activity (c) Estimate the annual electricity consumption in lightin

100 W and CFL of 18 W for burning 6 hrs
 Here’s the table

By replacing a **100W incandescent bulb with an 18W C

**₹538

Activity 6: Energy Conservation Measures in Air-conditio

Activity (a) Collect from the market the specification

and work out the cost of energy consumed for runnin
as shown in Table
Table 6.1 Cost Calculations for

Electricity Rate: ₹6 per unit (kWh)

Usage: 1000 hours

Activity (b)
tivity 5 Energy Conservation Measures in Lighting: 9 Marks
Estimate the hours of light use when there is no one in the rooms as
shown in Table 5.1.

Monthly
Daily Hrs of Idle
Wattage (W) Consumption of Idle
Use Unit
'(1) Running (KWh)
'(2)
(1) * (2) * 30/1000
100 0.5 1.5 kWh
60 0.75 1.35 kWh
40 1 1.2 kWh
36 2 2.16 kWh

6.21 kWh

37.26 x KWh x Rs/KWh

Assumption : 6 Rs/
Unit price

bulbs with lower wattage in halls, stair ways, and other areas of general
mination. Estimate the energy saved as shown in Table 5.2.

Monthly Energy
Wattage Replaced (W) Wattage Saved (W) Daily Hours of Use
Saved (KWh)
(40 × 0.5 × 30) ÷
60 40 0.5
1000 = 0.6
(20 × 0.75 × 30) ÷
40 20 0.75
1000 = 0.45
(20 × 1 × 30) ÷
20 20 1
1000 = 0.6
(18 × 2 × 30) ÷
18 18 2
1000 = 1.08

**(0.6 + 0.45 + 0.6

+ 1.08) = 2.73
KWh**
**2.73 × 6 =
₹16.38**

ate the annual electricity consumption in lighting of a incandescent bulb of

100 W and CFL of 18 W for burning 6 hrs/day.
 Here’s the table format for **Annual Electricity Consumption of Lighting Fixtures*

Electricity
Sr. No. Fixture Type Usage (hrs/day)
Consumed (KWh)
(100W × 6hrs ×
Incandescent Bulb
1 6 365) ÷ 1000 =
(100W)
**219 KWh**
(18W × 6hrs ×
2 CFL (18W) 6 365) ÷ 1000 =
**39.42 KWh**
Additional
Electricity
**(219 - 39.42) =
3 Consumption by
179.58 KWh**
Incandescent and
its Cost

ing a **100W incandescent bulb with an 18W CFL**, the annual electricity savings is **179.58 KWh**, which tra
**₹538.74 per year** in savings.

Energy Conservation Measures in Air-conditioning Unit: 10 Marks`

ty (a) Collect from the market the specifications of 1.5 Ton Window Air Conditioners
ork out the cost of energy consumed for running 1000 Hrs. You should work the cost
as shown in Table 6.1.
Table 6.1 Cost Calculations for ACs: Window AC

Brand Brand A Brand B Brand C

Star Rating 3-Star 5-Star 4-Star
Energy Efficiency Ratio (EER) 3.1 3.5 3.3
Cooling Capacity (kW) 5.2 5.2 5.2
Rate of Energy Consumption
1.68 1.48 1.57
(kWh/hr)
Total Energy Consumption
1680 1480 1570
(1000 hrs)
6 10,080.00 8,880.00 9,420.00
13.81 12.16 12.90

Since lowering the thermostat by 1°C increases running costs by 15%, we can calculate the n
consumption as follows:
 New Energy Consumption=Original Consumption+(15% of Original Consumption)\text{New En
Consumption} = \text{Original Consumption} + (15\% \text{ of Original
Consumption})New Energy Consumption=Original Consumption+(15% of Original Consumpti

Given that the original consumption at 25°C is 100 units, we calculate:

100+(100×0.15)=100+15=115 units100 + (100 \times 0.15) = 100 + 15 = 115 \

text{ units}100+(100×0.15)=100+15=115 units

So, if the temperature is set at 24°C, the AC will consume 115 units in a month, which is 15% mo
25°C.
of Lighting Fixtures**:

Cost of Electricity @
Rs. 3/KWh (Rs.)

**₹657**

**₹118.26**

**₹538.74**

58 KWh**, which translates to

Brand D
2-Star
2.8
5.2
1.86

1860
11,160.00
15.29

can calculate the new energy

 ption)\text{New Energy
of Original
Original Consumption)

we calculate:

0 + 15 = 115 \

, which is 15% more than at

Table 7.1: Cost Calculations for Desert Coolers of Similar Siz

Parameter Cooler A
Rating of Motor
(W) 180
Power Factor 0.85
Rating of Pump
(W) 40
**Energy
Consumption
(KWh)** 540
540
Rate-6/unit
esert Coolers of Similar Size (48”)

Cooler B Cooler C Cooler D

200 220 240

0.9 0.88 0.92

50 45 55

600 660 720

600 660 720
Activity 8: Energy
Conservation Measures in
Refrigerators: 5 Marks
Activity (a) Determine the cost of the energy consumed in your refrigerator by noting the
following parameters:
1. Type of refrigerator (single door/double door):-------------------------------
2. Rating of refrigerator (Liters): --------------------------------------------------
3. Rating of refrigerator (W): ------------------------------------------------------
4. Average Loading of refrigerator (partly, half, full): -------------------------
5. KW or Tonnage of the refrigerator: --------------------------------------------
6. Distance from the wall:-----------------------------------------------------------
7. Energy consumed per month-----------------------------------------------------
noting the
Activity 9: Energy
Conservation Measures in
Bathrooms: 5 Marks
Activity (a): Measure the water used in your house for:
(1) Bathing:-----------------Liters (Buckets of 15 liters) or the one is available in your home
(2) Washing clothes---------Liters (as above)
(3) Estimate the amount of water used in one month and then in one year(Liters)----------
(4) No of leaky tapes----------
(5) Measure the amount of water in 30 minutes: -------------------(in liters, glass or by any measureable m
(6) Estimate the amount of water leaked in one year.
(7) Estimate the % of leaked water: (6)*100/(3).----------------------
by any measureable method).
Activity
10: Solar
Water
Heaters:
14 Marks