Electrical 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?

How does the design of a CFL bulb differ from a filament bulb?

Explain the design of a CFL bulb.

CFLs utilises more energy than incandescent bulbs

 In a CFL, an electric current is driven through a tube containing argon and a small amount of mercury vapour.

Explain the working and mechanism of a CFL lamp.

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 _____.

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-