Physics Current Electricity UHS 2024
PMDC Verified Question 17 of 112
1 kWh = ____ J?
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:

The Kilowatt-hour is a massive unit of commercial energy relative to the tiny Joule.

Solution:

  • Convert kilowatts to watts: \( 1 \text{ kW} = 10^3 \text{ W} \).


  • Convert hours to seconds: \( 1 \text{ hour} = 3600 \text{ seconds} \).


  • Multiply: \( 10^3 \text{ J/s} \times 3600 \text{ s} = 3.6 \times 10^6 \text{ Joules} \).


  • The prefix for \( 10^6 \) is Mega. Thus, the answer is 3.6 MJ.


Why other options are incorrect:

  • Opt A: Ignores all metric multipliers.


  • Opt B: Too small by a factor of 1000.


  • Opt D: Too large by a factor of 1000.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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