First slide

Electrical power

Question

Ten identical electric bulbs, each rated 220 V, 50 W are used in parallel on 220 V line for 10 hours per day in a month of 30 days .T he electric energy consumed in kilo watt hours is :

Easy

A

1500
B

15000
C

15
D

150

Solution

Energy consumed = Pt = (50 W) $(10 \frac{hours}{day})$ (30 days).
= 15000 W hours = 15 kWh

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