Science General · Physics

Energy and Electrical Devices

1,182 Questions

Energy and electrical devices focus on energy conversion, household electrical appliances, batteries, and electric vehicle technology. These principles are essential components of general science syllabi across major competitive examinations. Review these practice questions to strengthen understanding of electrical energy applications and devices.

Energy conversionHousehold electrical appliancesBatteries and cellsElectric vehicles

Energy and Electrical Devices Questions

Multiple choice physics towards green energy non-conventional sources of energy electric energy generation and environment renewable and non-renewable energy

Which of the following devices transforms light energy into chemical energy?

  1. Car dynamo

  2. Electric motor

  3. Electric fan

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

None of the listed devices (car dynamo, electric motor, electric fan) transform light energy into chemical energy. Photosynthesis in plants is the primary natural process that performs this transformation.

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

A feature common to both AC and DC generator is ______.

  1. Split rings

  2. Electrical energy is converted to mechanical energy

  3. Slip rings

  4. Mechanical energy is converted to electrical energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Electric generator, also called dynamo, any machine that converts mechanical energy to electricity for transmission and distribution over power lines to domestic, commercial, and industrial customers. Generators also produce the electrical power required for automobiles, aircraft, ships, and trains.A feature common to both AC and DC generator is Mechanical energy is converted to electrical energy

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

Electric generator ____________.

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

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

  1. electric circuit

  2. magnetic field

  3. electromagnetic induction

  4. none
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. electromagnets and coils respectively

  2. induces and commutator respectively

  3. coils and electromagnet respectively

  4. commutators and inducer respectively
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

The major differences between an electric motor and generator are stated below

  1. the generator converts mechanical energy into electrical energy while motor converts electrical energy into mechanical energy.

  2. the generator converts electrical energy into mechanical energy while motor converts mechanical energy into electrical energy.

  3. both

  4. none
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Electric Motor
1. It converts electrical energy into mechanical energy.
2. It needs electrical energy for its working.
3. They are used as water pumps, marble grinders e.t.c Generator
1. It converts mechanical energy into electrical energy
2. It needs mechanical energy for its working.
3. They are used as water pumps, marble grinders e.t.c
3. Diesel generator, hydro-electric generator are the examples of it.