Question

Difficulty: EasyElectrical Energy and Power

An electric lamp rated at 60W60\,\text{W} is kept switched on for 50seconds50\,\text{seconds}. What is the total electrical energy consumed by the lamp during this time?

  1. 3000J3000\,\text{J}Answer
  2. B
    300J300\,\text{J}
  3. C
    1.2J1.2\,\text{J}
  4. D
    110J110\,\text{J}

Answer

3000J3000\,\text{J}
Electrical energy is calculated using the formula E=P×tE = P \times t. Substituting the given values P=60WP = 60\,\text{W} and t=50st = 50\,\text{s} gives E=60×50=3000JE = 60 \times 50 = 3000\,\text{J}.

Step-by-Step Solution

1
Identify the given physical quantities.
Power P=60WP = 60\,\text{W} and time t=50st = 50\,\text{s}.
Power is given in watts (J/s\text{J/s}) and time is given in seconds.
2
Apply the electrical energy formula E=P×tE = P \times t.
E=60W×50s=3000JE = 60\,\text{W} \times 50\,\text{s} = 3000\,\text{J}.
Total electrical energy is the product of power dissipation and time duration.

Key Concept

Electrical Energy and Power
Estimated Time:45s
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