Class: 3 Science: Revision worksheet Strand: Electricity
Name: _______________________ Date:
1. If you are building an electric circuit, what components would you need?
_________________________________________________________________________
Draw an electric circuit using the above-mentioned components.
2. In our classroom, when we build a circuit, which power source must we use? And why?
_________________________________________________________________________
_________________________________________________________________________
3. Amy and Maddy make two different circuits.
Amy’s circuit Maddy’s circuit
In whose circuit will the bulb (or bulbs) be brighter? ___________________ .
Give reason for your answer: __________________________________________________
_________________________________________________________________________
4. Observe the below circuit. Do you think this circuit will work? _______________.
Explain your answer:
___________________________________________
___________________________________________
___________________________________________
5. It was Jane’s mom’s birthday. While decorating the hallway Jane found a broken wire.
Help Jane pick the safest material to wrap the outside of the wire and give a reason.
__________________________________________________________
__________________________________________________________
__________________________________________________________
__________________________________________________________
6. Some appliances need more power to work than others.
List down any five electrical appliances that use a single
battery and any five electrical appliances that use more
than two batteries to work
Single battery appliance Multiple battered appliances
7. Grade 3 learners tested different materials to see if they were conductors or insulators.
They recorded their results in the below table.
Observe the above table and write the conclusion of their experiment:
____________________________________________________________________________
____________________________________________________________________________
8. Study the below electric circuit.
Will bulb A remain lit if bulb B is removed?
________________________________________________
Why do you think so?
________________________________________________
________________________________________________
________________________________________________
9. Nathan sets an electric circuit.
He wants to find out whether the number of bulbs will affect
the brightness of the bulbs in the circuit.
(a) Write down two ways in which he can change the electric
circuit to find out.
Way 1: ___________________________________________________________________
___________________________________________________________________
Way 2: ___________________________________________________________________
___________________________________________________________________
(b) Write down three controlled variables that he should keep the same to make sure that the test is fair.
Variable 1: ________________________________________________________________
Variable 2: ________________________________________________________________
Varible 3: _________________________________________________________________
10. A hairdryer uses electricity from the mains.
Write down three safety precautions that you should take when using a hairdryer.
1: ________________________________________________________________________
2: ________________________________________________________________________
3: ________________________________________________________________________
11. A group of learners modelled what happens in a ciruit.
Think about what is happening in the picture to help you
to answer these questions.
(a) Why must the learners make sure that they are all holding
hands in the model circuit?
______________________________________________
______________________________________________
(b) What happens to the flow of electricity when the learners do not hold hands and the model circuit is
broken?
__________________________________________________________________________
__________________________________________________________________________
(c) How could you model a switch in the circuit?
__________________________________________________________________________
__________________________________________________________________________
12. Henry and Mike connect an electrical circuit.
Henry moves the wire X from 0 cm to 8 cm.
Mike writes down how bright the lamp is for each distance.
He uses a scale from 0 to 100.
100 is the brightest on the scale.
Distance in cm Brightness of lamp
0 100
2 80
Here are the first three results. 4 60
6
8
(a) Complete the sentence.
As the distance increases the brightness of the lamp _________________________
(b) Predict the brightness of the lamp for the distance of 6 cm. Circle the correct answer
0 20 40 60 80
(c) Complete the sentence by choosing the best word from the following.
Conductor Insulator Metal Plastic Solid
Graphite is a good electrical ___________________________ .
13. Observe the below circuit.
(a) Draw arrows to show the path of the electricity flow in the circuit.
14. Lily investigates how the intensity of a lamp is affected by the number of lamps in a series circuit.
She makes three circuits, as shown below.
When the switch in each circuit is closed, which lamp will be the brightest: X, Y, or Z? __________
15. Look at this circuit.
Row Bulb 1 Bulb 2
1 Becomes brighter Becomes brighter
2 Becomes brighter Goes out
3 Goes out Goes out
4 Goes out Becomes brighter
5 Becomes dimmer Becomes dimmer
If bulb 2 burns out, which row on the table correctly shows what will happen to bulbs 1 and 3?
_________________________________________________________________________
16. List down any three ways to save electricity.
Way 1: ___________________________________________________________________
___________________________________________________________________
Way 2: ___________________________________________________________________
___________________________________________________________________
Way 3: ___________________________________________________________________
___________________________________________________________________
17. Look at the given picture carefully.
Can you spot the dangers of using electrical equipment in this? Colour all the dangers.
