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.