Electrical Energy and Calculations: Understanding the Relationship Between Power, Current, Voltage, and Time

This video tutorial explores the relationship between electrical energy, voltage, current, and time. It explains how to calculate the energy transferred by an electrical device using the formula E = I * V * t. The tutorial includes examples of calculating energy transfer in a resistor, determining the current drawn by a TV, and finding the time required for a bulb to transfer a specific amount of energy.

What is the unit of electrical power?

• Watts

• Amps

• Volts

• Joules

How is power related to energy and time?

• Power is energy divided by time

• Power is energy multiplied by time

• Power is time divided by energy

• Power is the square of energy

Which formula represents the energy transferred by a device?

• E = I + V + t

• E = I * V * t

• E = I / V / t

• E = I - V - t

If a resistor draws 0.8 amps and has a voltage of 6 volts, how much energy is transferred in 120 seconds?

• 600 Joules

• 576 Joules

• 720 Joules

• 480 Joules

A TV transfers 23,460 joules of energy every minute with a voltage of 230 volts. What is the current drawn by the TV?

• 2.5 amps

• 1.7 amps

• 1.5 amps

• 2.0 amps

What is the time taken for a bulb drawing 3.5 amps with a voltage of 12 volts to transfer 12,600 joules of energy?

• 250 seconds

• 200 seconds

• 350 seconds

• 300 seconds

Which of the following is NOT a factor in calculating the energy transferred by a device?

• Voltage

• Current

• Resistance

• Time