Questions on Electric Circuits
Q13.
A circuit is shown below.
![](electricitydiagram13.png)
(a) The switch is open. Steven connects point A to point B with a piece of copper wire. Which bulbs, if any, light up?
Bulb X ![](../../../graphics/symbols/nuclides/ticksmall.png)
1 mark
(b) Steven removes the copper wire and uses it to connect point C to point D. The switch is still open. Which bulbs, if any, light up?
Neither light up. ![](../../../graphics/symbols/nuclides/ticksmall.png)
1 mark
(c) Steven removes the copper wire and closes the switch. Both bulbs light up, but not very brightly. He then uses the copper wire to connect point B to point C.
![](electricitydiagram13a.png)
(i) What happens to bulb X?
It goes out ![](../../../graphics/symbols/nuclides/ticksmall.png)
1 mark
(ii) What happens to bulb Y?
It gets brighter. ![](../../../graphics/symbols/nuclides/ticksmall.png)
1 mark
(d) Steven removes the copper wire. The switch is still closed. Both bulbs light up, but not very brightly. He then uses the copper wire to connect point A to point B.
![](electricitydiagram13b.png)
(i) What happens to bulb X?
It gets brighter.![](../../../graphics/symbols/nuclides/ticksmall.png)
1 mark
(ii) What happens to bulb Y?
It goes out. ![](../../../graphics/symbols/nuclides/ticksmall.png)
1 mark
Maximum 6 marks