Electric Power

Q. Which of the following components of the electric power transmission does not step down the transmitting voltage?

1. Main sub-station
2. City sub-station
3. Grid sub-station
4. Electric pole

Q.

A bulb of resistance 1 ohm is connected across a battery of 10 V. Find the power consumed.

1. 0.01W

2. 100W

3. 0.1 W

4. 10 W

Q.

If 100 J is the energy required for an appliance to run per second, then what is the power consumed by it in watts, if it operates at 220V?

1. 22000 W

2. 22 W

3. 100 W

4. Data insufficient

Q. Which among the following is correct, where I = current, V = Potential difference, R = Resistance and P = electric power?

1. $P=\frac{V^2}{R}$
2. $VI=P^2$
3. $P=I^v$
4. $V=P^{2}I$

Q.

Mathematical expression for electric power(P), where $I$ is current and $R$ is resistance, is;

1. $P=IR$
2. $P=\frac{I}{R}$
3. $P=\frac{R}{I}$
4. $P=I^{2}R$

Q.

Power is defined as work done per unit ___.

1. volume
2. area
3. time
4. length

Q.

Which unit among the following can represents electric power?

1. None of these

2. J

3. W

4. VA

Q.

When a bulb of resistance $1\Omega$ is connected across a battery, it draws a constant power of $400W$. What is the total power drawn when $4$ such bulbs are connected in series across the same battery?

1. 50W

2. 100W

3. 25W

4. 0.25W

Q.

An electric bulb is rated $220V$ and $100W.$ When it is operated at $110V,$ the power consumed will be

1. $100\text{W}$
2. $75\text{W}$
3. $50\text{W}$
4. $25\text{W}$

Q.

The current through a $10V$ tungsten filament lamp connected to a $10V$ source of negligible resistance is $2A$. Calculate the electrical energy (in kWh) consumed in $5hours$.

1. 0.2 kWh

2. 100 kWh

3. 0.1 kWh

4. 20 kWh