# PH.11 a, c-d - Electrical Circuits

The student will investigate and understand how to diagram, construct, and analyze basic electrical circuits and explain the function of various circuit components. Key concepts include

a)  Ohm’s law;

c)  electrical power; and

d)  alternating and direct currents.

Bloom's Levels:  Analyze; Understand

### BIG IDEAS

• I can design circuits for a home that will provide the electricity needed.
• I can explain what the measurements on a light bulb mean.
• I can explain the differences between batteries and wall outlets.

### UNDERSTANDING THE STANDARD

The concepts developed in this standard include the following:

• Current is the rate at which charge moves through a circuit element.
• Electric potential difference (voltage) in a circuit provides the energy that drives the current.
• According to Ohm’s law, the resistance of an element equals the voltage across the element divided by the current through the element.
• Potential difference (voltage) is the change in electrical potential energy per unit charge across that element.
• The dissipated power of a circuit element equals the product of the voltage across that element and the current through that element.
• In a DC (direct current) circuit, the current flows in one direction, whereas in an AC (alternating current) circuit, the current switches direction several times per second (60Hz in the U.S.).

### ESSENTIALS

In order to meet this standard, it is expected that students will

a) apply Ohm’s law to a series and a parallel circuit.

solve simple circuits using Ohm’s law.

c) calculate the dissipated power of a circuit element.

d) recognize that DC power is supplied by batteries and that AC power is supplied by electrical wall sockets.

### KEY VOCABULARY

Updated: Dec 01, 2017