Physics Work & Energy UHS 2022
PMDC Verified Question 39 of 108
The consumption of energy by a 60 W bulb in 2s is:
A
120 J
B
30 J
C
60 J
D
0.02 J
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 120 J
Concept:

Electrical energy consumed is calculated by multiplying the power rating by the operational time in standard units.

Formula:

$$ E = P \times t $$

Solution:

  • Power (\( P \)) = 60 W (Joules per second)


  • Time (\( t \)) = 2 s


  • Energy \( E = 60 \text{ J/s} \times 2 \text{ s} = 120 \text{ Joules} \)


Why other options are incorrect:

Dividing power by time yields 30 J (Option B). Forgetting to multiply by 2 gives 60 J (Option C).

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