In the diagram above, three identical lamps each of 100 W are connected in parallel across a potential difference of 250 V. Calculate the reading of the ammeter.

In the diagram above, three identical lamps each of 100 W are connected in parallel across a potential difference of 250 V. Calculate the reading of the ammeter.

A 7.5A
B 2.5A
C 1.2A
D 0.8A
E O.4A

waec 1993 physics

The correct answer is C. 1.2A

P = VI ; I = P/V = 100/250 = 0.4A each

Total current 3 x 0.4 = 1.2A

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