Electric Bill Calculation

Q. Calculate the electricity bill of a household for a month (having 30 days) using the following details. (An electric unit costs Rs. 3.45/-)

1. Rs. 1455
2. Rs. 3500
3. Rs. 1289
4. Rs. 2797

Q.

Define electric power. Write SI unit of power and derive the formula for power.

Q.

An electric motor of power $1000W$ , operates at $250V$ . Calculate the inductive resistance of the motor and current flowing through it.

Q. An electrical appliance having a resistance of 200 ohm is operated at 200 V. Calculate the energy consumed by the appliance in 5 minutes ​
(a) in joule, ​
(b) in kWh

Q. One kilo watt hour equals ______ $J$ (joules) of energy.

1. $1.2$ $\times$ ${10}^6$
2. $2.4$ $\times$ ${10}^6$
3. $3.6$ $\times$ ${10}^6$
4. $4.8$ $\times$ ${10}^6$

Q.

We have an electric kettle rated at (60V, 5A). What is the electrical energy dissipated by the kettle in 5 minutes of continuous operation?

1. 100 m/s

2. 60√20 m/s

3. 50 m/s

4. 30√20 m/s

Q.

A current $I$ flow through resistance $R$ for the time $t$, the electric energy consumed by the resistance is

1. $I\times R\times t$

2. $I\times R^2\times t$

3. $I^2\times R\times t$

4. $\frac{I^2\times R}{t}$

Q. The energy expended in $1kW$ electric heater in $30\text{seconds}$ will be:

1. $3\times {10}^{4}erg$
2. $3\times {10}^{4}eV$
3. $3\times {10}^{4}J$
4. $0$

Q.

If the electric consumption of your house is $20kWh$ in one day and the cost of electricity is $Rs4$ per unit, find out how much electricity bill you will have to pay for one month($30days$).

1. $Rs.1200$

2. $Rs.800$

3. $Rs.2400$

4. $Rs.3600$

Q. When we pay for our electricity bill, we are paying for the ____________.

1. power used
2. current used
3. energy used
4. charge used

Q.

In India, household circuits are rated at___.

1. 200 V AC

2. 230 V AC

3. 250 V AC

4. 230 V DC