Electric Power

An electric bulb is rated as $5 \mathrm{W}, 110 \mathrm{V}$. How many of these bulbs can be connected in parallel across the two wires of $110 \mathrm{V}$ supply line if the maximum current which can be drawn is $5 \mathrm{A}$?

How many $60 \mathrm{W}$ bulbs may be safely run on $220 \mathrm{V}$ using a $5 \mathrm{A}$ fuse?

Two electric bulbs A and B are marked $60 \mathrm{W}, 220 \mathrm{V}$ and $100 \mathrm{W}, 220 \mathrm{V}$ respectively. Which one of the two bulbs has greater resistance?

Which one will consume more energy- (i) a $300 \mathrm{W}$ television set in $1 \mathrm{h}$ or (ii) $1000 \mathrm{W}$ electric heater in $10$ minutes?

State whether an electric heater will consume more or less electrical energy per second when the length of its heating element is reduced. Give an explanation for your answer.

The amount of energy consumed by an electrical appliance in unit time is called _____.

Three identical resistors each of resistance $R$ are connected to an ideal cell of voltage $V$ as shown. Total power dissipated in all three resistors is

If a bulb of $60 \mathrm{W}$ is connected across a source of $220 \mathrm{V}$, find the current (in ampere) drawn by it.

An electric bulb is rated $220 \mathrm{V}$ and $100 \mathrm{W}$. When it is operated on $110 \mathrm{V}$, the power consumed will be –

$1 \mathrm{kW} \mathrm{h}$ is equal to

An electric refrigerator rated $400 \mathrm{W}$ is used for $8$ hours a day. An electric iron box rated $750 \mathrm{W}$ is used for $2$ hours a day. Calculate the cost (in rupees) of using these appliances for $30$ days, if the cost of $1 \mathrm{kWh}$ is $₹3$.

An electric bulb is connected to a source of $220 \mathrm{V}$ and the current flowing through the circuit is $0.5 \mathrm{A}$. Calculate the power of the bulb in watts?

The rate at which energy is delivered by a current is the _____of the appliance.

$5$ electrical appliances are used for $10$ hours per day in a home. If two appliances are of $200 \mathrm{W}$ and three appliances are of $400 \mathrm{W}$ then find number of units consumed by these appliances in a day.

If a $60 \mathrm{W}$ bulb is used $8 \mathrm{h}$ per day for $30$ days  then what will be the energy consumption in electric unit ?

What is electric power? Write the necessary formula for it.

What do you mean by electric power?

An electrical device is said to consume $1 \mathrm{kw} \mathrm{hr}$ of energy if it consumes-

If the voltage in the circuit doubles and the current is halved, the electric power