O-LevelPhysicsElectricity5054/11 · May/June 2019 · Q381 Mark
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?
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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
✓ Correct answer
C: the voltage supplied to lamp Y: increases, the power supplied to lamp Y: increases
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