Physics · May / June 2019 · Paper 11 · Question 38
5054Series and parallel circuits
A teacher uses the circuit shown. The identical lamps X and Y are connected to a low voltage a.c. power supply by high resistance transmission wires. Both lamps are switched on. Lamp X is then switched off. Lamp Y stays switched on. What happens to the voltage and the power supplied to lamp Y?
- Avoltage decreases, power decreases
- Bvoltage decreases, power stays the same
- Cvoltage increases, power increases
- Dvoltage increases, power stays the same
As printed in the paper
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Correct answer: C. voltage increases, power increases
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