Physics Current Electricity DUHS 2023
PMDC Verified Question 46 of 112
One kilowatt-hour (1kWh) equals to:
A
3.6 J
B
3.6 KJ
C
3.6 MJ
D
3.6 GJ
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 3.6 MJ
Concept:

Convert the commercial unit of energy into standard SI metric prefixes.

Solution:

  • 1 kilowatt = \( 10^3 \) Watts (Joules/sec).


  • 1 hour = 3600 seconds.


  • 1 kWh = \( 1000 \text{ W} \times 3600 \text{ s} = 3,600,000 \text{ Joules} \).


  • In scientific notation with prefixes: \( 3.6 \times 10^6 \text{ J} \).


  • The prefix for \( 10^6 \) is Mega (M). Thus, it equals 3.6 MJ.


Why other options are incorrect:

  • Opt A: Missing all multiplier zeros.


  • Opt B: Kilo (K) is only \( 10^3 \).


  • Opt D: Giga (G) is \( 10^9 \).

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