Explanation

• Energy sources are divided into conventional and non-conventional.
• Conventional sources are reliable and used on a large scale.
• They provide continuous energy supply.
• Non-conventional sources depend on natural conditions like sun or wind.
• Natural gas is a conventional and widely used energy source.

Last verified on 04-05-2026

Explanation

• Natural petroleum is found deep inside the earth.
• It is not directly usable in its raw form.
• It exists as a thick, dark liquid mixture.
• This raw form is called crude oil.
• It is later refined into useful products like petrol, diesel, and kerosene.
• Crude oil is also called “black gold.”

Last verified on 03-05-2026

Explanation

• Coal is a non-renewable resource because it takes millions of years to form and cannot be replenished quickly.
• Pakistan uses coal for energy production, especially in power plants like the Thar coal project.

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

• Kinetic energy is the energy an object possesses due to its motion.
• Any moving object, such as a car, a ball, or a person, has kinetic energy.
• The amount of kinetic energy an object has depends on its mass and velocity.

Last verified on 18-03-2026

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

• 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).