1 Ahmad connects an electrical circuit like below.
Both lamps light up.
By choosing from these symbols, complete the circuit diagram for his electrical circuit.
A B C D E F
You only need to write the letter of the symbol in the spaces provided.
2 Youssef is building electrical circuits.
(a) When the switch is closed, the lamp does not light up. Give one reason.
(b) Youssef builds a new electrical circuit.
The lamps do not light up. Give one reason.
3 Max measures the current in different electrical circuits.
(a) Max connects an electrical circuit as shown below. Complete the sentences.
The circuit diagram shows a ………………………. circuit. The component shown by is
………………………. . This component measures ………………………. .
(b) Max connects an electrical circuit with one cell and two lamps.
The reading on A1 is 0.125 A.
Write down the two missing readings.
The reading on A2 is ……………………….. A.
The reading on A3 is ……………………….. A.
(c) Max connects three more circuits using the same size cells and lamps.
The reading on A4 is 0.25 A.
Write down the two missing readings.
The reading on A5 is ……………………….. A.
The reading on A6 is ……………………….. A.
4 Complete the sentences.
In an electrical circuit, electrons flow from the ……………………… terminal to the …………………….
terminal. This is because electrons have a ………………………… charge. The movement of
electrons causes the flow of ………………………. in an electrical circuit. This flow can be
measured using an ……………………………. . When the electrons move ………………………, the
current will increase.
5 The diagram below shows four electrical circuits.
(a) Based on the diagrams, how many lamps, in total, will light up? Tick (✓) one box.
0 1 2 3 4
(b) Which one is the circuit symbol for cell? Tick (✓) one box.
(c) Sarah uses different objects to complete this electrical circuit.
(i) Predict what will happen to the lamp if the object used is made out of aluminium.
(ii) Predict what will happen to the lamp if the object used is made out of graphite.
(d) Sarah makes another circuit.
What should Sarah do if she wants the lamp to be brighter?
6 A student makes an electrical circuit as shown in the diagram below.
(a) On the diagram, draw arrows (→) to show the direction of the flow of electrons in the
circuit.
(b) Wires are used to connect the components in an electrical circuit.
(i) If material A is an electrical conductor, what type of material is material B?
(ii) Give one reason for your answer in (b)(i).
(iii) Name two examples that you can use as material B.
7 Yuna wants to investigate how different components in an electrical circuit can change the
current.
The diagrams below show two electrical circuits that Yuna makes.
(a) When Yuna measures the current in both circuits, she finds that both circuits have the
same current. Why?
(b) Yuna builds more electrical circuits. The table lists the number of components in each
circuit she makes.
Electrical
No. of cells No. of lamps No. of ammeters
circuit
A 0 1 1
B 1 2 1
C 2 1 1
D 2 2 1
All the components used in the circuits are identical.
(i) What is the factor that is kept the same in this experiment?
(ii) Which circuit(s) will light up?
(iii) In which circuit will the lamp(s) light up the brightest?
(iv) In which circuit will the lamp(s) light up the dimmest?
