Priyanka B Solutions for Chapter: Electricity, Exercise 13: Practice Problems-VII

A lamp rated $200 \mathrm{W}$ at $220 \mathrm{V}$ is connected to the mains electric supply. What is its resistance?

An electric lamp is marked $220 \mathrm{V}, 100 \mathrm{W}.$ It is used for $5$ hours daily. Calculate energy consumed in $\mathrm{kWh}/\mathrm{day}$.

An electric heater is used on $220 \mathrm{V}$ supply and takes a current of $3.4 \mathrm{A}.$ Calculate its resistance when it is in use.

Two identical resistors each of resistance $10 \mathrm{\Omega }$ are connected in parallel, to a battery of $6 \mathrm{V}.$ Calculate the ratio of power consumed in the combination of resistors in this case.

A lamp rated $100 \mathrm{W}$ at $220 \mathrm{V}$ is connected to the mains electric supply, what is its resistance?

A $500 \mathrm{W}$ electric Iron used in a house for $2$ hours per day. Calculate the cost to use it for $60$ days at ₹$3.20$ per kWh.

An electric iron consumes energy at a rate of $840 \mathrm{W}$ when heating is at the maximum rate and $360 \mathrm{W}$ when the heating is at the minimum. The voltage is $220 \mathrm{V}$. What are the current and the resistance in each case.

An electric device operates at $24 \mathrm{V}$ and has a resistance of $8 \mathrm{\Omega }$. Calculate its power consumed by the device and current flowing through it.