2024 · M/J · 5054/22 | Q6

0/45parts marked · 0 of 80 marks

Question (6 of 9)9 marks · Practise this topic →

Options

Theory: answer all nine questions. Show working and appropriate units; diagrams and alternative valid methods are marked against the original scheme.

(a)Fig. 6.1 shows a cell, fixed 240 Ω resistor and LDR; Fig. 6.2 shows its current–voltage lines. State Ohm’s law.

Answer guidance

State A short answer. No explanation is needed, and adding one cannot earn extra marks.

[2 marks]

(b)Explain how Fig. 6.2 shows that Ohm’s law applies to this LDR.

Answer guidance

Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.

[1 mark]

(c)Use numerical values from Fig. 6.2 to explain how light affects LDR resistance.

Answer guidance

Using You must use the thing it names. An answer that reaches the right value another way may not score.

[2 marks]

(d)(i)With the lamp on in the Fig. 6.1 series circuit, LDR current is 0.050 A. Determine current in the fixed resistor.

Answer guidance

Determine Work it out from what you are given or from the figure, and show how you got there.

[1 mark]

(d)(ii)With the lamp on, Fig. 6.1 LDR current is 0.050 A and the fixed resistor is 240 Ω. Use Fig. 6.2 to calculate the cell e.m.f., in V.

Answer guidance

Using You must use the thing it names. An answer that reaches the right value another way may not score.

[3 marks]

5054/22/M/J/24Cambridge O Level Physics 5054 · May/June 2024 · Paper 2 variant 2 · Question 6