Physics · May / June 2019 · Paper 12 · 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?
- Athe voltage supplied to lamp Y decreases; the power supplied to lamp Y decreases
- Bthe voltage supplied to lamp Y decreases; the power supplied to lamp Y stays the same
- Cthe voltage supplied to lamp Y increases; the power supplied to lamp Y increases
- Dthe voltage supplied to lamp Y increases; the power supplied to lamp Y stays the same
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Correct answer: C. the voltage supplied to lamp Y increases; the power supplied to lamp Y increases
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