Question

A 2 kilowatt heater and 200 watt TV and three bulbs of hundred watt each are all switched on from 6 p.m. to 10 p.m. what is the total cost at Rs 5.50 per kilowatt hour

Answer 1

HEATER
1KW=1000w
2KW= 1000×2=2000w
TV
200w
BULB
3×100=300w
total watt=2500w
KW=2500÷1000=2.5KW
E=P×T
=2.5×4 (HOUR 6PM TO 10PM)
=10.0
=10KWH
Total price =10×5.50
=55.00 RS