Question of Exercise 1

Electricity of Class 10

Question
Electromotive force represents

Answer

Option 1Force

Option 2Energy

Option 3Energy per unit charge

Option 4Current

Frequently Asked Questions

An electric motor works on the principle

A: of electromagnetic induction

B: when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously.

C: both A and B

D: None of the above

 

Solution:

Explanation:

In an electric motor the electrical energy is converted into the mechanical energy.

And the motor used the magnetic effect of the current.

It is saying that when a rectangular coil is placed in a magnetic field and current is passing through it then a force is exerted in the coil which rotates the coil.

Final Answer:

The option(B) is correct.

 

State joules law of heating

Solution:

Explanation:

It is used to calculate the rate at which electric energy is converting into the heat energy due to electrical resistance.

The formula of joule’s law of heating is Q = I2RT

Here, Q is the heat energy, I is the electric current, R is electric resistance and T is the time interval.

Final Answer:

Hence, the  joule's law of heating is = I2RT.

 

Write Joules law of heating

Solution:

Explanation:

  • A conductor becomes heated when an electric current flows through it for a long time. Joule's law of heating describes

the heating of a conductor caused by the flow of electric current across it.

Heat geretated

H=i2Rt

Here, i is the current running through the conductor, R is thHe conductor's resistance, and t is the length of time the current has flown.

Final answer:

Hence, Joule’s law of heating is given by H=i2Rt.

 

Name some devices in which electric motors are used

 
 

Solution:

Explanation:

  • In contrast to an electric generator, an electric motor is a device that converts electricity into mechanical energy. 
  • They work on the basis of electromagnetism, which states that when an electric current is present in a magnetic field, a force is applied. 
  • Motors feature a lot of moving elements that allow them to spin and provide power as needed.

Electric motors that are used in certain devices are:

  1. Pumps for water
  2. Fans with electricity
  3. Mixers with electricity
  4. Machines for washing

Final answer:

Some devices in which electric motors are used are water pumps, electric fans, electric mixers, washing machines, etc.

 

What is symbol of battery

symbol of battery

Solution:

Explanation:

A cell has two terminals: positive and negative.

The longer side represents the positive terminal and other is the negative terminal.

A battery is made up of more than two cells. Hence, the symbol of battery is: 

symbol of battery1

Final Answer:

Hence, option A is correct.

 

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