Lesson: The Power of Electrical Components High School Physics

Physics

In this lesson, we will learn how to use the formula E = QV to find the energy dissipated to the environment by the component of an electronic circuit.

Video

10:37

Sample Question Videos

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02:19

Worksheet

Q1:

A 7 Ω resistor and a 5 Ω resistor are connected in series to a cell. The cell provides a current of 4 A through the circuit. How much energy do the resistors transfer to the surrounding environment in 20 seconds?

Q2:

Which of the following is the correct formula for the energy transferred to the environment when an amount of a charge, , is moved across a potential difference, ?

Q3:

An electric motor is connected to a 9 V battery. Over a period of time, the motor converts 450 J of electrical energy into kinetic energy, heat, and sound. How much charge passes through the motor over this period of time?

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