Tag: effects of electric current

Quizzes (19) Questions (134)

Questions Related to effects of electric current

Multiple choice physics effects of electric current electric generator ac generator magnetic effects of electric current

Complete the sentence by using the correct words given in the brackets:

A ________ (generator / transformer/motor/transducer) is a source of electricity that generates large amount of electricity in a power house.

  1. Motor

  2. Generator

  3. Transducer

  4. Transformer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A generator is a device that converts mechanical energy into electrical energy. It is the source of electricity used to generate large amounts of electricity in power house.

Multiple choice physics effects of electric current electric generator ac generator magnetic effects of electric current

If the coil in a simple generator is wound around a soft iron core then:

  1. strength of magnetic field increases.

  2. current produced will be increased.

  3. voltage produced will be increased.

  4. all
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Voltage/current produced in a generator can be increased by: 
a) Using a powerful electromagnet to make the magnetic field stronger in place of a permanent magnet.
b) By winding the coil round a soft iron core to increase the strength of magnetic field.
c) By using a coil with more turns.
d) By rotating the coil faster.
e) By using a coil with a larger area.

Multiple choice physics effects of electric current electric generator ac generator magnetic effects of electric current

If we use a powerful electromagnet in place of permanent magnet in a generator, then:

  1. voltage produced by the generator increases.

  2. current produced by the generator increases.

  3. Both A and B are true.

  4. No effect on current or voltage occurs.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If a powerful electromagnet is used instead of a permanent magnet, magnetic field strength increases. This increase in magnetic field strength leads to the increase in induced voltage in the coil. An increased voltage leads to an increased induced current in the generator.

Multiple choice physics effects of electric current electric generator ac generator magnetic effects of electric current

Which of the following can't increase the voltage produced by the generator?

  1. Using a powerful electromagnet to make the magnetic field stronger in place of a permanent magnet.

  2. By winding the coil round a soft iron core to increase the strength of magnetic field.

  3. By using a coil with more turns.

  4. Changing the material of the coil.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Voltage/current produced in a generator can be increased by:
a) Using a powerful electromagnet to make the magnetic field stronger in place of a permanent magnet.
b) By winding the coil round a soft iron core to increase the strength of magnetic field.
c) By using a coil with more turns.
d) By rotating the coil faster.
e) By using a coil with a larger area.

Multiple choice physics effects of electric current electric generator ac generator magnetic effects of electric current

Fleming's left and right hand rule are used in

  1. DC motor and AC motor

  2. DC generator and AC motor

  3. DC motor and DC generator

  4. both rules are same, any one can be used
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

DC motor is a device which coverts electrical energy into mechanical energy. It employs Fleming's left hand rule.
DC generator converts mechanical energy into electrical energy in from of DC. It employs Fleming's right hand rule.

Multiple choice physics effects of electric current electric generator ac generator magnetic effects of electric current

Generators uses the principle of ________ to push electrons through a wire.

  1. electromagnetic induction

  2. electromagnetic reduction

  3. magnetoelectric conduction

  4. electric induction

  5. magnetic field contraction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The EMF generated by Faraday's law of induction due to relative movement of a circuit and a magnetic field is the phenomenon underlying electrical generators. When a permanent magnet is moved relative to a conductor, or vice versa, an electromotive force is created. If the wire is connected through an electrical load, current will flow, and thus electrical energy is generated, converting the mechanical energy of motion to electrical energy.