Tag: magnetic effects of electric current

Questions Related to magnetic effects of electric current

A dynamo converts:

physics magnetism and electromagnetism electric generator ac generator magnetic effects of electric current

  1. electrical energy into mechanical energy

  2. electrical energy into heat energy

  3. mechanical energy into electrical energy

  4. heat energy into electrical energy

Show answer
Correct Option: C
Explanation:

A dynamo converts mechanical energy into electrical energy.

In an AC generator, the ends of the coil are connected to ____________.

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

  1. two slip rings

  2. the split ring commutator

  3. the external circuit directly

  4. None of these

Show answer
Correct Option: A
Explanation:

The slip rings allow the transfer of alternating e.m.f. induced in the rotating coil to the external circuit. Each ring is connected to one end of the coil wire and is electrically connected to the external circuit via the conductive carbon brushes.

So, In an AC generator, the ends of the coil are connected to two slip rings
Therefore, A is correct option

Electric generator ____________.

physics magnetism and electromagnetism electric generator ac generator magnetic effects of electric current

  1. Converts electric energy into magnetic energy.

  2. Converts electric energy into mechanical energy.

  3. Converts mechanical energy into electrical energy.

  4. Converts magnetic energy into electrical energy.

Show answer
Correct Option: C
Explanation:

An electric generator is a machine which generates electricity by using the principle of EMI. It converts mechanical energy into electrical energy.

An electric generator actually acts as :

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

  1. source of electric charge

  2. source of heat energy

  3. an electromagnet

  4. a converter of energy

Show answer
Correct Option: D
Explanation:

An electric generator is a machine which generates electricity by using the principle of electromagnetic induction. It converts mechanical energy to electrical energy.

Electric generator (Dynamo) generates electricity by using the principle ______.

physics magnetism and electromagnetism electric generator ac generator magnetic effects of electric current

  1. electric circuit

  2. magnetic field

  3. electromagnetic induction

  4. none

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Correct Option: C
Explanation:

Electric generator (Dynamo) generates electricity by using the principle electromagnetic induction
The generator/dynamo is made up of stationary magnets (stator) which create a powerful magnetic field, and a rotating magnet (rotor) which distorts and cuts through the magnetic lines of flux of the stator. When the rotor cuts through lines of magnetic flux it makes electricity.

Dynamos is a device that _______.

physics magnetism and electromagnetism electric generator ac generator magnetic effects of electric current

  1. reduces electric power

  2. generates electricity

  3. step down the voltage

  4. the voltage

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Correct Option: B
Explanation:

An electric generator (Dynamo) is a machine which generates electricity by using the principle of electromagnetic induction.

Principle behind electric generator is

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

  1. when a straight conductor is moved in the electric field, then current is induced in the conductor.

  2. when a circular loop is moved in electric field, then current is induced in the conductor.

  3. when a straight conductor is moved in a magnetic field, the current is induced in the conductor.

  4. none

Show answer
Correct Option: C
Explanation:

Electric generator is the application of EMI. The electric generator woeles on the principle that when a straight conductor is moved in magnetic field, then current is induced in the conductor.

Generators used in power stations to generate electricity are

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

  1. DC generators

  2. AC generators

  3. Both

  4. None

Show answer
Correct Option: B
Explanation:

AC generators are used in power station to generate electricity, which is supplied to our hours. AC generator is also h/a alternator.

There is no ________ in AC generator.

physics magnetism and electromagnetism electric generator ac generator magnetic effects of electric current

  1. ship rings

  2. electromagnets

  3. commulator

  4. generator coil

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Correct Option: C
Explanation:

There is no commutator in AC generator. In DC generator, we connect the two ends of the coil to the commutator consulting two half rings of copper.

In large powerhouse generator, the ________ are stationary and the _______ rotates

physics magnetism and electromagnetism electric generator ac generator magnetic effects of electric current

  1. electromagnets and coils respectively

  2. induces and commutator respectively

  3. coils and electromagnet respectively

  4. commutators and inducer respectively

Show answer
Correct Option: C
Explanation:

The power house AC generators have a fixed site of coil arranged around a relating electromagnet. Thus, in large power house generators, the coils are stationary are the electromagnet rotates.