# Electrical Energy Equation | Problems

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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