Unit 2: Electricity

What is electric current and how is it caused by moving electric charges? What are the effects of charge and electric fields on conductors and insulators?

What is charge and how is it measured? How is current and voltage calculated?

What does Ohm's law state about resistance? What is the relationship between resistance and temperature?

How is resistance calculated in series and parallel circuits? What is the relationship between resistance and the length of a conductor?

What is the difference between alternating current (AC) and direct current (DC? How is electricity used to power devices in homes?