Task 2: Problem solving
1. A 14 V battery powers the headlights of a car. What is the resistance of the headlights if they draw 3.0 A of current when turned on?
2. A toaster has a resistance of 28 Ω and is plugged into a 110 V circuit. Using the GRASS method, what current is measured?
3. A microwave oven draws 12 A of current on a 110 V household circuit. What is its power rating?
4. What current is drawn by a 90 W light bulb on a 110 V household circuit?

Task 3: AC and DC current

Compare and contrast AC and DC current. Explain why AC rather than DC current is used in homes to supply electricity.