Electric Energy and 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?

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

Read the given passage and answer the following question:

The home electrical connection consists of 'live', 'neutral' and 'earth' wires. The 'live' and the 'neutral' wires have potential difference of $220 \mathrm{V}$. The 'earth' is connected to ground. Due to a fault in the equipment or if the plastic coating on the 'live' and the 'neutral' wires give a path for the two wires to come in contact with each other and a large current flows through it producing heat. If any inflammable material (such as wood, cloth, plastic, etc.) exists around that place it can catch fire. Therefore, a fuse wire is used as a precautionary measure.

From the below choose the name of the wire that is used to limit the current in an electric circuit by melting due to overheating when excessive current passes through it.

Read the given passage and answer the following question:

The home electrical connection consists of 'live', 'neutral' and 'earth' wires. The 'live' and the 'neutral' wires have potential difference of $220 \mathrm{V}$. The 'earth' is connected to ground. Due to a fault in the equipment or if the plastic coating on the 'live' and the 'neutral' wires give a path for the two wires to come in contact with each other and a large current flows through it producing heat. If any inflammable material (such as wood, cloth, plastic, etc.) exists around that place it can catch fire. Therefore, a fuse wire is used as a precautionary measure.

Choose the two wires having potential difference of $220 \mathrm{V}$.

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?

Flow of large current due to direct contact of a live and a neutral wire is called _____ (short-circuit/ Overloading).

At the time of the short circuit, the current in the circuit_____________.

If the live wire and neutral wire come in contact either directly or via conducting wire, then it is called _____.

The most important safety device used for protecting electrical appliances from short-circuiting or overloading is ____________.

At the time of short circuit, the current in the circuit

The melting point of the wire used in the heater element is high while a _____wire has a low melting point.

The _____ effect of electric current is used in the working of an electric fuse.

$5$ 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?