O-LevelPhysicsElectricity5054/21 · May/June 2016 · Q84 Marks
Fig. 8.1 shows a circuit that contains a battery, a fixed resistor of resistance 1000Ω and a variable resistor R. [Figure 8.1]
- (a)(i)State the relationship between the current Iß in the battery, the current I₁ in the fixed resistor and the current I₂ in the variable resistor.[1]
- (a)(ii)State an equation that relates the potential difference (p.d.) V across the battery, the p.d. V₁ across the fixed resistor and the p.d. V₂ across the variable resistor.[1]
- (b)The p.d. across the battery is 9.0V. The resistance of R is set at 500 Ω. Calculate the current in R.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.
- [B1] same/equal or IB = I1 = I2
- [B1] (p.d. of) battery is sum of (p.d. across) fixed resistor and (p.d. across) the variable resistor or VB = V1 + V2
- [C1] (I=) V/R numerical or algebraic in any form
- [A1] 0.006(0) A
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