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 simple electric circuits bulbs bulb bulb connected to an electric cell

An electric bulb converts electrical energy into

  1. sound energy

  2. mechanical energy

  3. nuclear energy

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

Due to passage of electric current, the tungsten filament of the bulb gets heated up and glows. Thus an electric bulb converts electrical energy into heat energy as well as light energy.

Hence option D is correct.

Multiple choice physics electro-magnetism applications of electromagnets transformer transformers

The device which is used for converting electrical energy into mechanical energy is called:

  1. Electric motor

  2. Dynamo

  3. Transformer

  4. Battery
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A

An electric motor is an electrical machine that corrects electrical energy into mechanical energy. Working of electric motor mainly depends upon the interaction of magnetic field with current.

Multiple choice physics electro-magnetism applications of electromagnets transformer transformers

A direct current (DC) motor is connected to a battery by means of two leads. The motor moves for slightly lessthan half the cycle and comes to halt. Which of the following components is missing?

  1. one of the brushes

  2. commutator

  3. slip ring

  4. one of the two magnets
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer is C.

Slip-ring commutator merely maintains a connection between the moving rotor and the stationary stator.
Slip rings are useful for DC motors where the current has to change direction every half revolution whereas split rings are used to make constant current connection to a commutator, which is what we want for an AC motor.
Hence, if the slip rings are not present, then the armature stops its rotation.

Multiple choice

Which of the following is NOT a type of hybrid vehicle?

  1. Series hybrid

  2. Parallel hybrid

  3. Plug-in hybrid

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

Mild hybrids are not considered true hybrids because they do not have the ability to drive on electric power alone.

Multiple choice

Which of the following is NOT a type of hybrid vehicle?

  1. Series hybrid

  2. Parallel hybrid

  3. Plug-in hybrid

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

Mild hybrids are not considered true hybrids because they do not have the ability to drive on electric power alone.

Multiple choice

What is the name of the technology that allows clothing to generate electricity from movement?

  1. Triboelectric nanogenerators

  2. Piezoelectric materials

  3. Solar cells

  4. Fuel cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Triboelectric nanogenerators convert mechanical energy from movement into electrical energy.

Multiple choice

What is the term used to describe the amount of energy consumed by a device or system per unit of time?

  1. Power

  2. Energy

  3. Work

  4. Efficiency
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Power is the term used to describe the amount of energy consumed by a device or system per unit of time, typically measured in watts (W).

Multiple choice

Which of the following is a measure of how efficiently a device or system converts energy from one form to another?

  1. Efficiency

  2. Power

  3. Energy

  4. Work
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Efficiency is a measure of how efficiently a device or system converts energy from one form to another, typically expressed as a percentage.

Multiple choice

Which type of charger is commonly used to recharge lithium-ion camera batteries?

  1. AC charger

  2. DC charger

  3. Solar charger

  4. Wireless charger
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

AC chargers are commonly used to recharge lithium-ion camera batteries. They convert alternating current (AC) from a power outlet into direct current (DC) suitable for charging the battery.

Multiple choice

Which type of charger is commonly used to recharge button cell camera batteries?

  1. AC charger

  2. DC charger

  3. Solar charger

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

DC chargers are commonly used to recharge button cell camera batteries. They convert direct current (DC) from a power source into a suitable voltage for charging the battery.

Multiple choice

Which type of charger is commonly used to recharge action camera batteries?

  1. AC charger

  2. DC charger

  3. Solar charger

  4. Wireless charger
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

AC chargers are commonly used to recharge action camera batteries, similar to other types of camera batteries.

Multiple choice

Which type of vehicle is powered by an electric motor that draws electricity from a battery?

  1. Hybrid electric vehicle

  2. Plug-in hybrid electric vehicle

  3. Battery electric vehicle

  4. Fuel cell electric vehicle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A battery electric vehicle (BEV) is powered solely by an electric motor that draws electricity from a battery. BEVs do not produce tailpipe emissions and have zero direct greenhouse gas emissions during operation.

Multiple choice

Which type of vehicle is powered by an electric motor that draws electricity from a hydrogen fuel cell?

  1. Hybrid electric vehicle

  2. Plug-in hybrid electric vehicle

  3. Battery electric vehicle

  4. Fuel cell electric vehicle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A fuel cell electric vehicle (FCEV) is powered by an electric motor that draws electricity from a hydrogen fuel cell. FCEVs produce zero direct greenhouse gas emissions during operation, as the only byproduct is water vapor.