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34 views6 pagesActivity (A 2, A 3, A 4)
The document outlines procedures for measuring resistance, voltage (both AC and DC), and checking continuity using a multimeter, along with the necessary apparatus and precautions. It also describes how to assemble a household circuit with bulbs and a fuse, detailing the theory behind household circuits and safety measures. Additionally, it includes steps for assembling an electrical circuit with various components, emphasizing the correct connections for measuring current and voltage.
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0% found this document useful (0 votes)
34 views6 pagesActivity (A 2, A 3, A 4)
The document outlines procedures for measuring resistance, voltage (both AC and DC), and checking continuity using a multimeter, along with the necessary apparatus and precautions. It also describes how to assemble a household circuit with bulbs and a fuse, detailing the theory behind household circuits and safety measures. Additionally, it includes steps for assembling an electrical circuit with various components, emphasizing the correct connections for measuring current and voltage.
Uploaded by
razabaquer271Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF or read online on Scribd
/ 6
VITY NO. A2 /-
Aim
To measure the resistance, voltage (a.c./d.c.), current (a.c.) and 0 check the oe
it usit i Nuity
of a given circuit using multimeter. ,
Apparatus
Three carbon resistors and one standard resistance coil, an eliminator with ta,
4 V & 6 V), a step-down transformer (6 - 0 — 6 V) with two tapings (2 y
resistor of 100 ohms so as to make an a.c. circuit, a plug key and multimeter,
PPings (2 y
and 4 yy. ,
(A) FOR MEASUREMENT OF RESISTANCE
Procedure
1. Mark the given carbon resistors as R,, R,, R.
2. Note the colour of Ist, 2nd, 3rd and 4th ting for each resistor and record in the
observation table. :
3. Plug in the probes of the multimeter in appropriate terminals (black in com. and red
in 4), select the appropriate range, short the other ends of probes and adjust zero,
‘Tum the terminal marked ‘Adjust’ such that the needle of the meter shows full scale
defiection and reads zero ohm.
4. Separate the metallic ends of the probes. Insert the resistor R, to be measured in
between the metallic ends of the two probes [Fig. 6.5 (a)] and read the deflection
Of the pointer on the range selected and record it in the observation table.
5. Repeat the step 4 for other resistors R, and R,, each time selecting the appropriate
Tange and testing the zero.
6. Convert using the colour code table, the values of resistors in ohms and write their
values with tolerance.
7. Complete the table of observation and compare the measured values with the decoded
values,
(B) D.C. VOLTAGE
1, Select a dic. source of Potential difference, 6 V battery eliminator or a battery.
2. Plug the probes black in com, and red in +,
3. Select dic. volt, by turning the selector switch to range 10 V d.c. volts.
4. Touch and press other ends of the
probes such that red is on the battery termind!
marked + and black on —
(Fig, 6.5 (b)] and note the reading,
5: Insert red probe in terminals marked 4 V, 2 V in succession and note the reading +(e
lack [| Red Red leek Probes
~-From .
Multimeter Selector switch on Selector switch o
elector switch set on ohm ares LON) ae, (200V)
‘Appropriate renge
Ja Measuring resistance (4) Measuring dic. voltage) Measuring a.c. voltage
(Metre Bridge)
D 8
Cxiok
uA
A
©
ee
y
t
Electrical circuit
(q) Checking Continuity
Fig, 6.5. Using a multimeter to measure : (a) resistance (b) de. voltage
fe) ace, voltage and (d) resistance and checking continuity
(©) A.C, VOLTAGE
1. Tum the selector a.c. (1000 volts).
2. Touch and press the probes’ other en
drop [Fig. 6.5 (c)] and note the reading.
rminals 50 V and 10 V in succession and record the reading.
©) CONTINUITY OF THE GIVEN CIRCUIT [Fig- 65 (dl
1. Set the selector switch to obm, range MW:
2. Touch and press the ends of probes at A and B, full scale
continuity.
3. Similarly check in succession the continuity between terminals B and C and terminals
Cand D. —
i inals of the
Never place the probes’ ends betw with the terminals of
battery.
In digital electronic multimeters rotor is set t
Sounds when the probes are connected t0 the ends of
ds to two terminals of a.c. source of potential
3. Use red probe in tet
deflection indicates
een terminals connected
9 mark 0 for continuity test and a buzzer
the component being tested. Record your observations as given below.
Observations
(a) For the Measurement of Resistance
Table 6.3
Resiss | Colour and Codes of Rings | Value and tolerance Value by
or 7 3 3 ‘4 from colour code | multimeter pi”
used ° 3 @ @ | ifference
/R, | Orange) Red Brown Silver 32 x 10! ~ 350
= + 300
al
R | te
(6) Measurement of Voltage
Table 6.4
A.C. or Obs. Voltage between Voltage reading as Difference in voltage
D.C. S.No. terminals _| measured by multimeter reading and voltage marked
Volts vy v v-v,
| (Volt) (Volt) | (Volt)
ieea = aS
a
|
a |
1a a be oi
Ded |
Hae | | aoe
Conclusion
coded values of the resistors.
1. Measured values by the multimeter match the de
urces match the voltage meas!
>, ac. and d.c. voltages marked on the voltage so
by the mutimeter.
Precautions
a is a v0
1. Instructions for handling the multimeter should be read carefully as it iB
delicate instrument and is likely to get damaged if used carelessly or ign! psi
2, Select the appropriate parameters i.e,, current, voltage or resistance to be mé
and set it on appropriate range. vi
a
3, If the range of the parameter to be measured is not known, start with the ™
For measuring V, never connect more than 600 V. Mae A
Aim A A hrké
ae ng three bulbs, three (on-off) switey,
To assemble a household circuit comprising hes, fey
and a power source.
Apparatus
Three bulbs (5 V, 1 W each), fuse of 0.6 A, power source of 10 V with tapings 4,
6 V, 8 V and 10 V and a main switch,
8 Q :
© S
@ 5
EG
us ;
yee eS =
ea Sao
cee tah to)
Fig. 6.6. (a) Circuit diagram (b) Actual layout
Theory
Houschold circuit functions on the main supply of 220 V, 50 Hz and current ratings of 5A
for domestic supply for normal appliances — bulbs, fluorescent tubes, fans etc.
Power Supply : 15 A for heavy load appliances — refrigerator, air conditioner, geyst.
hot plate etc.
Total power consumption