Lakhmir Singh and Manjit Kaur Solutions for Chapter: Electricity, Exercise 31: Very Short Answer Type Questions

An electric bulb is rated at $220 \mathrm{V}, 100 \mathrm{W}$. What is its resistance?

What is the SI unit of (i) electric energy and (ii) electric power?

Name the quantity whose unit is (i) $\mathrm{kilowatt}$, and (ii) $\mathrm{kilowatt}-\mathrm{hour}$.

Which quantity has the unit of $\mathrm{watt}$?

What is the meaning of the symbol $\mathrm{kWh}$? Which quantity does it represent?

If the potential difference between the end of a wire of fixed resistance is doubled, by how much does the electric power increase?

An electric lamp is labelled $12 \mathrm{V}, 36 \mathrm{W}$. This indicates that it should be used with a $12 \mathrm{V}$ supply. What other information does the label provide?

What current will be taken by a $920 \mathrm{W}$ appliance if the supply voltage is $230 \mathrm{V}$?