Physics Work & Energy SZABMU 2022
PMDC Verified Question 43 of 108
Kilowatt hour is a unit of:
A
Energy
B
Energy \( \times \) time
C
Power
D
(Power) (energy)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Energy
Concept:

The kilowatt-hour is a commercial unit of energy formed by multiplying power (kW) by time (hours).

Formula:

$$ E = P \times t $$

Solution:

  • Power \( \times \) time = Energy.


  • 1 kWh = 3.6 Megajoules.


  • Therefore, it measures energy, not power itself.


Why other options are incorrect:

Energy \( \times \) time is Joule-seconds (action). Power is just Joules/second (Watts).

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