Question

An electric bulb is marked $100\mathrm{W},250\mathrm{V}$. What information does this convey?

Answer 1

Step 1: Given data

We have,

Power of electric bulb $=100W$

Voltage of electric bulb $=250V$

Step 2: Conclusion

So, from above we can conclude that,

If the bulb is lightened at a voltage of $250V$ then it will consume a power of $100W$ in one hour.

Hence, we can also conclude that it will consume $100J$ of energy if the bulb is lightened for because $1Watt=1Joule/sec.$