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Energy and Power - Engineering

Q1:

If you used 400 W of power for 30 h, you have used

A 1.3 kWh

B 13.3 kWh

C 1.2 kWh

D 12 kWh

ANS:D - 12 kWh

P = 400.
T = 30
:PT = 12000.

PT/1000.
= 12.