Question

A 100 volt bulb has a resistance of 500
ohms. The number of hours it can work for
every kWh of energy consumed will be
(B) 40
(D) 60.
(A) 20
(C) 50
​

Answer 1

Answer:

C

Explanation:

the answer is C as shown in fig

Answer 2

(C) 50 hours.

Here, according to the given information, we are given that,

A 100 volt bulb has a resistance of 500 ohms.

Again, we are also given that, the voltage of the bulb is 100V.

Then, utilizing this, we can find out the power that has been consumed by the bulb. Now, in order to find the power consumed by the bulb which has a resistance of 500 ohms, we need to divide the square of the voltage by the resistance of the bulb.

Then, we get,

Power consumed by the bulb which has a resistance of 500 ohms = $\frac{V^{2} }{R} = \frac{100^{2} }{500} = \frac{10000}{500} = 20W$.

Now, we need to find the amount of energy consumed.

Now, $\frac{1000}{20} = 50$ hours.

Hence, option c that is 50 hours is correct.

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