Question

The electric energy (in kWh) consumed in operating a bulb of 60 W for 10 hours a day is

• A. 0·6
• B. 6
• C. 36
• D. 12

Answer 1

The Correct Option is A

To find the electric energy consumed by a 60 W bulb operating for 10 hours a day, we need to use the formula for electrical energy consumption:

\[ \text{Energy (kWh)} = \frac{\text{Power (W)} \times \text{Time (hours)}}{1000} \]

Given that the power of the bulb is 60 W and the time it operates per day is 10 hours, we substitute these values into the formula:

\[ \text{Energy} = \frac{60 \times 10}{1000} \]

\[ \text{Energy} = \frac{600}{1000} \]

\[ \text{Energy} = 0.6 \text{ kWh} \]

Thus, the electric energy consumed in operating the bulb for 10 hours a day is 0.6 kWh.

Answer 2

We are given:

• Power of the bulb = 60 W = \(60 \, \text{watts} = 0.06 \, \text{kW}\)
• Time used per day = 10 hours

Now, electric energy consumed is given by:

\[ \text{Energy (in kWh)} = \text{Power (in kW)} \times \text{Time (in hours)} \]

\[ = 0.06 \times 10 = 0.6 \, \text{kWh} \]

Correct Answer: 0.6