A-LevelPhysicsD.C. circuits9702/23 · May/June 2020 · Q57 Marks
Define the volt.
- (a)Define the volt.[1]
- (b)(i)the combined resistance of the two resistors connected in parallel[1]
- (b)(ii)the total resistance between terminals X and Y.[1]
- (c)(i) 1.55 Ω[1]
- (c)(i) 2.300 Ω.[3]
- (c)(ii)Calculate the potential difference between X and Y.[1]
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Mark scheme
Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.
- [B1] joule per coulomb
- [A1] R = 75 Ω
- [A1] R = 130 Ω
- [C1] P = I²R or P = VI and V = IR
- [A1] I = (0.20/55)⁰.⁵ = 0.060 A
- [A1] I = 0.060/4 = 0.015 A
- [A1] potential difference = 130 × 0.060 = 7.8 V
- [(A1)] or potential difference = (300 × 0.015) + (55 × 0.060) = 7.8 V (other valid methods are also possible)
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