CIE iGCSE Co-Ordinated Science P4.3.1 Circuit diagrams and circuit components Exam Style Questions Paper 3
Question
(a) A torch (flashlight) contains two cells, a lamp and a switch connected in series.
Fig. 3.1 shows an incomplete circuit diagram for the torch.
(i) Complete the circuit diagram in Fig. 3.1 for the torch using electrical symbols.
Fig. 3.1
(ii) A voltmeter is connected to measure the potential difference across the lamp.
Add a voltmeter to your circuit diagram in Fig. 3.1 using the correct electrical symbol.
(iii) Fig. 3.2 shows a cell and lamp used in the torch.
Use information from Fig. 3.2 to explain why two cells are used to light the lamp.
(iv) Use information from Fig. 3.2 to calculate the resistance of the lamp when lit.
(v) The cell provides an electromotive force (e.m.f.) to the circuit.
Complete the sentence.
The e.m.f. of an electrical source of energy is measured in ……………. .
(b) Fig. 3.3 shows a single ray of light from the torch shining on a mirror.
(i) State the relationship between angle K and angle L.
(ii) State the name of the dotted line AB.
(iii) State what happens to the ray of light at point C.
▶️Answer/Explanation
Ans : 3(a)(i) correct symbols for lamp and switch ;
all in series and all else correct ;
3(a)(ii) voltmeter connected across the lamp ;
correct symbol ;
3(a)(iii) lamp needs 3.0 V so two 1.5 V cells ;
3(a)(iv) resistance = pd/current (in any form) or 3.0 / 1.5 ;
= 2.0 (Ω) ;
3(a)(v) volts ;
3(b)(i) angle K equals angle L ;
3(b)(ii) normal ;
3(b)(iii) reflected / reflection ;