Question

A bulb is rated$100W-240V$. What information does the marking convey?

Answer 1

1. A bulb is a power-consuming device, which emits light when electricity passes from them.
2. Power is the rate of doing work, as $\mathrm{power}(\mathrm{in}\mathrm{W})=\frac{\mathrm{energy}(\mathrm{in}\mathrm{J})}{\mathrm{time}(\mathrm{in}\mathrm{s})}$.
3. $100W$ represents the power consumption of the bulb.
4. $100W$ means $100J$ of electrical energy is used in the bulb for every $1second$.
5. And $240V$ indicates that 240 volts of potential difference is required to operate this bulb.
6. Thus, the voltage required to operate the bulb is $240V$and the power consumption of the bulb is $100W$.