Question

calculate the electricity bill amount for a month of 30 days, if the following devices are used as specified: 2 bulbs of 40 W for 6 hours, 2 tubelights of 50 w for 8 hours and a TV of 120 w for 6 hours.
Given: the cost of electricity is RS. 2.50 per unit.
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Answer 1

Answer:

cast of the electricity bill for 30 days is is 150 rupees

Answer 2

This is a question from Chapter-Work and Energy Class 9th

Solution:

Step 1: Calculate energy consumed by 2 bulbs,2 Tube lights and 1 TV

For Bulbs=(2*p*t)=2*40*6=480 Wh

For Tube lights=(2*p*t)=2*50*8=800 Wh

For TV=p*t=120*6=720 Wh

Total energy consumed by all these electrical appliances in 1 day =480+800+720 Wh

=2000 Wh= 2 Kwh= 2 units (1 Kwh=1000 Wh)

Energy consumed by all these electrical appliances in 28 days= 2*28=56 units

Cost=units*Rate=56*2.50=Rs. 150

Therefore, Electricity bill= Rs. 150

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