Physics Work & Energy ETEA 2022
PMDC Verified Question 51 of 108
Electricity consumption is calculated commercially in:
A
Kilo-watt
B
Kilo-watt hour
C
Mega watt
D
Giga watt
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Kilo-watt hour
Concept:

Commercial electricity is billed based on total energy consumed, not the instantaneous power draw.

Formula:

$$ E = P \times t $$

Solution:

  • Power units (Watts, Kilowatts, Megawatts) only measure the rate of energy use.


  • To measure total energy, power must be multiplied by time.


  • The standard commercial unit is the Kilo-watt hour (kWh), which equals \( 3.6 \times 10^6 \text{ Joules} \).


Why other options are incorrect:

Options A, C, and D are strictly units of Power, not Energy.

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