An electric lamp rated at 60\,\text{W} is kept switched on for 50\,\text{seconds}. What is… — JAMB UTME

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

$3000\,\text{J}$ Answer
B
$300\,\text{J}$
C
$1.2\,\text{J}$
D
$110\,\text{J}$

Answer

3000\,\text{J}

Electrical energy is calculated using the formula

E = P \times t

. Substituting the given values

P = 60\,\text{W}

and

t = 50\,\text{s}

gives

E = 60 \times 50 = 3000\,\text{J}

Step-by-Step Solution

Identify the given physical quantities.

Power

P = 60\,\text{W}

and time

t = 50\,\text{s}

Power is given in watts (

\text{J/s}

) and time is given in seconds.

Apply the electrical energy formula

E = P \times t

E = 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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