Question

1. Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric
supply at 220 V.
(a) Draw a circuit diagram to show the connections.
(b) Calculate the current drawn from the electric supply.
(c) Calculate the total energy consumed by the two lamps together when they operate for one hour.
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Answer 1

Answer:

Here is your answer

Explanation:

We have two lamps.

Power of lamp 1, P1 = 60 W ; Voltage, V = 220 V

Power of lamp 2, P2 = 40 W ; Voltage, V = 220 V

Two lamps are connected in parallel t the electric supply.

(a) The required circuit diagram is shown below:

(b) Total power of the two lamps = 60 + 40

= 100 W

Applied voltage, V = 220 V

Current drawn from the electric supply,

I = straight P over straight V space equals space 100 over 220 space equals space 5 over 11 straight A space equals space 0.45 space straight A

(c) Total energy consumed in one hour = 60 W x 1 h + 40 W x 1 h = 100 Wh = 0.1 kWh.

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