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The **electrical energy equation**, expressed as E = P × t, establishes a relationship between the electrical energy (E) consumed or produced by a device, the electrical power (P) at which it operates, and the duration of operation (t). By using this equation, one can calculate the amount of electrical energy consumed or produced by a device based on its electrical power and the duration of operation.

## Practice problems

### Problem #1

Calculate the electrical energy consumed by a 60 W electric bulb when it is switched ON for 5 minutes.

**Solution**

Given data:

- Electrical power, P = 60 W
- Time, t = 5 minutes = 300 s
- Electrical energy, E = ?

Applying the formula:

- E = P × t
- E = 60 × 300
- E = 18,000 J

Therefore, the electrical energy used by an electric bulb is **18,000 J**.

### Problem #2

A 50-inch LED TV with a power rating of 100 W operates for 20 minutes. Determine the electrical energy consumed by the television.

**Solution**

Given data:

- Electrical power, P = 100 W
- Time, t = 20 minutes = 1200 s
- Electrical energy, E = ?

Applying the formula:

- E = P × t
- E = 100 × 1200
- E = 120,000 J

Therefore, the electrical energy used by a LED TV is **120,000 J**.

### Problem #3

Calculate the electrical energy used by a 500 W microwave oven that operates for 10 minutes.

**Solution**

Given data:

- Electrical energy, E = ?
- Electrical power, P = 500 W
- Time, t = 10 minutes = 600 s

Applying the formula:

- E = P × t
- E = 500 × 600
- E = 300,000 J

Therefore, the electrical energy used by a microwave oven is **300,000 J**.

### Problem #4

What is the amount of electrical energy consumed by a 1000 W water heater when it is turned ON for 6 minutes?

**Solution**

Given data:

- Electrical energy, E = ?
- Electrical power, P = 1000 W
- Time, t = 6 minutes = 360 s

Applying the formula:

- E = P × t
- E = 1000 × 360
- E = 360,000 J

Therefore, the electrical energy used by a water heater is **360,000 J**.

## Related

## More topics

- Thermal energy equation
- Potential energy formula
- Gravitational potential energy formula
- Electric potential energy formula
- Elastic potential energy formula
- Kinetic energy formula
- Rotational kinetic energy formula
**Electrical energy equation**- Mechanical energy formula
- Photon energy equation
- Conservation of energy formula

## External links

- https://study.com/learn/lesson/electrical-energy-formula-power.html
- https://www.fire2fusion.com/electric-energy/electric-energy-equation.html

Deep

Learnool.com was founded by Deep Rana, who is a mechanical engineer by profession and a blogger by passion. He has a good conceptual knowledge on different educational topics and he provides the same on this website. He loves to learn something new everyday and believes that the best utilization of free time is developing a new skill.