Question:

The energy consumed by a 1000 W electric bulb when it is used for 1 hour is

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Energy consumed is \( E = P \times t \). Convert time to seconds (1 hour = 3600 s) and ensure the unit of energy is Joules (J).
Updated On: May 19, 2025
  • 3.6 $\times 10^3$ W
  • 3.6 $\times 10^6$ J
  • 3.6 $\times 10^6$ W
  • 3.6 $\times 10^3$ J
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The Correct Option is B

Approach Solution - 1

The energy consumed by an electric device is given by: \[ E = P \times t \] Where:
- \( P = 1000 \, \text{W} \) (power of the bulb),
- \( t = 1 \, \text{hour} = 3600 \, \text{s} \) (time in seconds).
Substituting the values: \[ E = 1000 \times 3600 = 3,600,000 \, \text{J} = 3.6 \times 10^6 \, \text{J} \] (Note: The unit of energy is Joules (J), not Watts (W), as Watt is the unit of power.) So, the energy consumed by the bulb is 3.6 $\times 10^6$ J.
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Approach Solution -2

Given:
Power of bulb, \( P = 1000\, \text{W} = 1000\, \text{J/s} \)
Time, \( t = 1\, \text{hour} = 3600\, \text{seconds} \)

Energy consumed,
\[ E = P \times t = 1000 \times 3600 = 3.6 \times 10^6\, \text{J} \]

Final answer:
\[ \boxed{3.6 \times 10^6\, \text{J}} \]
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