Explanation

• Fuel stores energy in the form of chemical bonds.
• When fuel burns in the engine, this chemical energy is converted into mechanical energy to move the car.
• Gasoline, diesel, and natural gas are common fuels storing chemical energy.
• The process of burning fuel to release energy is called combustion.

Last verified on 15-03-2026

Explanation

Non-renewable energy sources:

• Oil
  
• Nuclear energy
• Petroleum
• Natural gas & coal

Renewable sources of energy:

• Solar energy
• Wind energy
• Hydroelectric power
• Biomass energy
• Geothermal energy
• Tidal energy

Last verified on 11-02-2026

Explanation

• Commercial energy consumption includes oil, gas, and coal used for industry, transport, and power generation.
• Oil is widely used in transportation and industry.
• It has the largest share in global commercial energy use.

Additional information:

• Coal is mainly used for electricity generation.
• Natural gas is considered a cleaner fossil fuel compared to coal and oil.

Last verified on 17-01-2026

Explanation

Heat from the Sun reaches Earth through radiation

It is the transfer of energy via electromagnetic waves (like infrared, visible light, UV) 

Sunlight takes an average of 8 minutes and 20 seconds to travel from the Sun to the Earth.

Explanation

Coal has long been the largest source of electricity generation worldwide.

It is widely used because of its availability and established infrastructure.

Explanation

An electric generator is a device that converts mechanical energy into usable electrical energy.

This process is based on the principle of electromagnetic induction.

Discovered in 1831 by British scientist Michael Faraday.

Explanation

• Potential energy is a measure of the energy an object has due to its position or state, and it determines how much work the object can perform.
• The amount of potential energy an object has is a function of its mass, height, and other factors.
• It can be converted into kinetic energy (the energy of motion) when the object is released or moved.
• For example, a ball at the top of a hill has a certain amount of potential energy due to its height, and as it rolls down the hill, this potential energy is converted into kinetic energy, allowing the ball to perform work (such as moving down the hill).

Explanation

In pair production, several quantities are conserved

Let's evaluate each option:

- Charge:

A charge is conserved in pair production, as the total charge before and after the interaction remains the same

Due to the opposite but equal charges of the electron and positron.

- Energy:

Energy is conserved in pair production, with the total energy before the interaction equal to the sum of the energies of the electron and positron after the interaction.

- Linear Momentum:

Linear momentum is conserved in pair production, with the total momentum before the interaction equal to the sum of the momenta of the particles involved.

Explanation

Kinetic energy is the energy of motion, and any object that is moving has kinetic energy.

• A moving car (energy from motion)
• A moving runner (energy from motion)
• A moving bicycle (energy from motion)

Explanation

Desalination is the process by which the dissolved mineral salts in water are removed.