Lesson: The Power of Electrical Components Physics • 9th Grade

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

Lesson Plan

Students will be able to

use to determine the energy gained or lost, , by a charge moving across a potential difference ,
use to find the power of a circuit component given the current, , through it and the potential difference, , across it,
use .

Lesson Presentation

Lesson Video

Lesson Explainer

Lesson Playlist

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Lesson 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?