O-LevelPhysicsElectricity5054/21 · May/June 2017 · Q55 Marks
Fig. 5.1 shows an arrangement of three resistors. [Figure 5.1]
- (a)Calculate the total resistance of this arrangement.[3]
- (b)The arrangement is connected to a d.c. power supply. Voltmeters are placed across the resistors, as shown in Fig. 5.2. There is a current in each resistor. [Figure 5.2] Compare the readings on the three voltmeters. There is no need for any calculation.[2]
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Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [1] 1/Rₚ = 1/R₁ + 1/R₂ or Rₚ = R₁R₂/ (R₁ + R₂), using 20 and 40 Ω to get 13(.3) Ω (for parallel part)
- [1] Rₜ = R₁ + Rₚ or 20 + any attempt at parallel calculation
- [1] 33(.3) Ω
- [1] V₂ = V₃
- [1] V₁ largest or larger than either V₂ or V₃
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