Physics Current Electricity NUMS 2023
PMDC Verified Question 48 of 112
1 kWh =
A
\( 0.36 \times 10^6 \text{ J} \)
B
\( 36 \times 10^6 \text{ J} \)
C
\( 3.6 \times 10^6 \text{ J} \)
D
\( 0.036 \times 10^6 \text{ J} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: \( 3.6 \times 10^6 \text{ J} \)
Concept:

Derive Joules from basic power and time conversions.

Solution:

  • \( 1 \text{ kW} = 1000 \text{ W} = 1000 \text{ J/s} \).


  • \( 1 \text{ h} = 3600 \text{ s} \).


  • Multiply them: \( 1000 \text{ J/s} \times 3600 \text{ s} = 3,600,000 \text{ Joules} \).


  • Expressed in correct scientific notation: \( 3.6 \times 10^6 \text{ J} \).


Why other options are incorrect:

  • Opt A, B, D: All represent the wrong decimal shift for the standard value of 3,600,000.

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