Question

A domestic electric circuit has a fuse of 5A. What is the maximum number of 100W (220V) bulbs that can be safely used in the circuit?

Answer 1

Hint: In order to solve this question, let us assume an unknown number of bulbs can be taken as x. By using the formula of power in terms of potential difference and the current such that we can solve this question.

Complete step by step answer:
Let x be the number of such bulbs that can be used.
Power of one bulb = 100 watt
Power of x bulbs (p) = $100 \times x$ watt
Potential difference $(V) =220 \text{ volts}$
$I=5 A$
We know that
$P= V I$
$\Rightarrow 100x =200 \times 5$
$\Rightarrow x = 11 \text{ bulbs}.$

Additional information: usually the fuse element is made up of an alloy which is the mixture of two metals, copper, silver and aluminum to produce a stable and expected characteristics. The fuse ideally would carry the current infinitely and melted quickly on a small amount.

Note:Electric power is the work done in unit time t. In this process the electrical energy is transferred from the electrical circuit. The electric power is generally produced by electric generators.