Question

The power consumed by a 300 V bulb, having a resistance of 100 ohms, is 3 Watts.

(a) True

(b) False

I have been asked this question by my school teacher while I was bunking the class.

My query is from Current Electricity in portion Current Electricity of Physics – Class 12

Answer 1

Correct answer is (b) False

To explain I would say: Electric power can also be calculated or represented in other ways, such as: Power = voltage × current; Power = current^2 × resistance; Power = \(\frac {voltage^2}{resistance}\). In this case, we can use the equation – Power = \(\frac {voltage^2}{resistance}\). Voltage = 300 V; Resistance = 100 ohms

Power = \(\frac {300 \times 300}{100}\)

= 900 Watts

Therefore, the power consumed by a 300 V bulb, having a resistance of 100 ohms, is 900 Watts.