**Electrical energy** (E) is the product of **electrical power **(P) and the **time** (t). Using the equation of electrical energy: **E = P × t**, the value of electrical energy can be calculated.

Let’s solve some problems based on this equation, so you’ll get a clear idea.

## Electrical Energy Practice Problems

**Problem 1:** Calculate the electrical energy used by an electric bulb of 60 W 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 = ?

Using the equation of electrical energy,

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 of 100 W runs for 20 minutes. Calculate the electrical energy used by the television.

Solution:

Given data:

Electrical power, P = 100 W

Time, t = 20 minutes = 1200 s

Electrical energy, E = ?

Using the equation of electrical energy,

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 which runs for 10 minutes.

Solution:

Given data:

Electrical energy, E = ?

Electrical power, P = 500 W

Time, t = 10 minutes = 600 s

Using the equation of electrical energy,

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 amount of electrical energy is used 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

Using the equation of electrical energy,

E = P × t

E = 1000 × 360

E = 360,000 J

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

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**Related:**

- 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
- Mechanical Energy Formula
- Photon Energy Equation
- Conservation of Energy Formula

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