Current, Ohm’s Law and Power

In this topic, you will learn about current. Potential difference, or voltage, creates charge flow, or current. Ohm’s Law relates current to the potential difference and properties of the conductor. You will learn to apply mathematical relationships between current, voltage, resistance and power that will help you to analyze more complicated situations.

Essential Questions:

• What is current?  
• What mathematical relationships exist among current, voltage and power?
• How does the power company calculate the cost of electrical power?