Electrical Energy : Definition, Units, Formula and Examples

Published on 29-Sep-2022

Electrical energy

Electrical energy is a type of energy that comes from electric potential energy. This energy also can be formed from the kinetic energy of charged particles. Electrical energy is the energy that gets converted from electric potential energy. The energy that is generated when electrons move from one particular place to another is called electrical energy. The current is formed when charged particles move through a medium such as a wire.

Units of electrical energy

The unit that is used for electrical energy is called joules. The unit is also called watt-second. The electrical energy of 1 joule gets transferred when a current of 1 ampere flows through a circuit for 1 second.

Examples of electrical energy

  1. Charges are moving through a conductor, such as a wire.
  2. Lightning
  3. Batteries
  4. Static electricity
  5. Electric wheels generate electrical energy.
  6. Doorbells
  7. Audio speakers
  8. Capacitors that store electricity

Situations where electrical energy is converted into mechanical energy

  1. Fans contain motors that convert electrical energy to mechanical energy from the fan.
  2. The electrical energy that is provided to as bulb gets converted into light and heat energy.

Equations involving electrical energy

E = vit

V is the voltage, and I is the current, and t is the time.

Q = it

E = QV

How to find Electrical Energy?

1. A bulb of 23v takes a current of 2a for 6 seconds. What is the energy transferred in it?

Putting it into the equation, E = 23 x 2 x 6 = 276 joules

2. A television of 230v takes a current of 5a for 6 seconds. What is the energy transferred in it?

Putting it into the equation, E = 230 x 5 x 6 = 6900 joules

3. A washing machine of 250v takes a current of 5a for 8 seconds. What is the energy transferred in it?

Putting it into the equation, E = 250 x 5 x 8 = 10000 joules

4. A refrigerator of 270v takes a current of 8a for 8 seconds. What is the energy transferred in it?

Putting it into the equation, E = 270 x 8 x 8 = 17280 joules

5. An oven of 210v takes a current of 5a for 9 seconds. What is the energy transferred in it?

Putting it into the equation, E = 210 x 5 x 9 = 9450 joules

6. A laptop charger has a charge of 15C, and the voltage of the laptop charger is 23v. What is the energy transferred by it?

putting it into the equation, E = Qv = 15x23= 345 joules

7. A mobile charger has a charge of 13C, and the laptop charger's voltage is 24v. What is the energy transferred by it?

putting it into the equation, E = Qv = 13x24= 312 joules

8. An oven has a charge of 15C, and the voltage of the oven is 25v. What is the energy transferred by it?

putting it into the equation, E = Qv = 15x25= 375 joules

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