Mathematics

Problem

A torch bulb works on a potential difference of

3\,\text{V}

and draws a current of

0.2\,\text{A}

. Calculate the power of the bulb. a)

6\,\text{W}

15\,\text{W}

0.6\,\text{W}

3\,\text{W}

Intuitive explanation

Power measures how fast electrical energy is being converted—in this case, into light and heat. The key insight is that power depends on both the voltage pushing charge through the bulb and how much charge flows per second (the current). You'll use the fundamental relationship $P = VI$ to connect these quantities directly.

Intuitive explanation

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