Physics · Oct / Nov 2025 · Paper 12 · Question 33
5054Series and parallel circuits
A cardboard tube has two wires, P and Q, connected to its ends. Inside the tube, wire P and wire Q are connected to two resistors. The potential difference (p.d.) between wire P and wire Q is 9.0 V and the current in the wires is 0.75 A. Which combination of resistors is inside the tube?
- Aa 0.75 Ω resistor and a 6.0 Ω resistor in parallel
- Ba 0.75 Ω resistor and a 6.0 Ω resistor in series
- Ca 20 Ω resistor and a 30 Ω resistor in parallel
- Da 20 Ω resistor and a 30 Ω resistor in series
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Correct answer: C. a 20 Ω resistor and a 30 Ω resistor in parallel
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