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### Upper Elementary Science - II4.16 Energy

Energy is the capacity to do work. There are many forms of energy -- chemical energy, heat energy, mechanical energy, muscular energy, etc. Everything that happens around us is due to energy. Any work that we do is due to energy.

#### Stored Energy and Moving Energy

Energy that is stored is called the potential energy.
Examples: water stored in a tank, food stored by a plant

Energy possessed by a moving body is called kinetic energy or moving energy.
Examples: moving car, an apple falling from a tree, etc.

#### Law of Transformation of Energy

Energy can never be created nor destroyed. It can only be transformed from one form to another.

Let us see some examples of energy transformation:

• A car uses chemical energy in gasoline to make heat energy and kinetic energy.
• An electrical bulb converts heat energy to light energy.
• A toaster converts electrical energy to heat energy.
• An electric fan converts electrical energy to kinetic energy.
• A television changes electrical energy into sound energy and light energy.
• While speaking over a telephone, our voice is converted to electrical energy and the phone on the other end converts the electrical energy into audible sound energy.

Directions: Answer the following questions.
 Q 1: The energy stored by a water tank isnone of the abovekinetic energypotential energynuclear energy Q 2: A moving car possesses solar energykinetic energynone of the abovewind energy Q 3: An electric heater convertslight energy to electrical energynone of the aboveelectrical energy to heat energyheat energy to light energy Q 4: Energy can be destroyedFalseTrue Q 5: A television convertsNone of the aboveSound energy to electrical energyLight energy to heat energyElectrical energy to sound energy Q 6: Energy can be created.FalseTrue Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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