Page 4 - X-CBW-ELECTRICITY

10. How does the voltage reading on voltmeter 1 compare with the voltage 1

identify the correct option.
(a) The voltage reading on V1 will be two times more than the reading on
V2
(b) The voltage reading on V1 will be less than the reading on V2
(c) The voltage reading on V1 will be the same as the reading on V2
(d) The voltage reading on V1 will be four times more than the reading on
V2
11. Before cleaning the light bulb in his room, Gautam turned off the light by 2
turning the switch off. Yet, he received an electric shock while cleaning the
bulb. Explain why the bulb connection was live though the switch was off.
12. The picture (P) below shows an electrical tester being used to check the 2
electric point. The picture (Q) is a diagram showing the internal parts of the
electrical tester.

(A) Give the most likely explanation why an electrician does not get an
electric shock when he touches the metallic touch screw and the lamp of
the tester glow.
(B) Which part of the tester prevents the shock when the metallic touch
screw is touched?
13. An incandescent bulb works on the heating effect of electric current. When 2
a current passes through the filament of a bulb, it heats the filament to a
high temperature which causes the filament to glow.
The graph below shows the variation in the current through a bulb
immediately after it is switched on. The current decreases from 1 A at time t