O-LevelPhysicsElectricity5054/21 · Oct/Nov 2021 · Q66 Marks
A circuit contains a battery of electromotive force (e.m.f.) 4.5V, a 28Ω resistor and a variable resistor. Fig. 6.1 is the circuit diagram. [Figure 6.1]
- (a)The battery consists of three identical cells in series. Determine the e.m.f. of each cell. e.m.f. of each cell[1]
- (b)(i)The potential difference (p.d.) across the variable resistor is 2.5V. State what is meant by potential difference.[2]
- (b)(ii)Calculate the resistance of the variable resistor. resistance =[3]
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Mark scheme
Marking points from the official mark scheme (Oct/Nov 2021). The mark or mark type is shown in brackets.
- [B1] 1.5 V
- [C1] work done / energy transferred when charge passes through a component
- [A1] work done / energy transferred charge passed
- [C1] 4.5 – 2.5 or 2.0 (V) seen
- [C1] (R =) V/I or 2.5/(2.0/28) or R/28 = 2.5/2.0
- [A1] 35 Ω
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