1. Using the following table, list two different combinations of bulbs and appliances that could be used on a 20-A circuit breaker in a 110-V system without causing the circuit breaker to trip.
Appliance Power Rating
Light bulb (60 W) ...............................60 W
Fluorescent bulb (40 W) .....................40 W
12" TV .................................................55 W
Projection TV ..................................1500 W
Personal computer .............................550 W
Hand drill ...........................................400 W
Microwave oven ...............................1000 W
2. Using the preceding table, list two different combinations that could be used on a 30-A circuit breaker in a 110-V system without causing the circuit breaker to trip.
3. Find the power output of a cell phone charger that delivers 400mA of current at 5.90 V dc.
4. A power supply for electronic devices delivers 1.10 A of current at 4.40 V. What is its power output?
5. At what rate does a light bulb convert electric energy to light if it draws 0.500 A of current on a 120-V outlet?
6. What power is used by a light that draws 2.00 A from a 12.0-V battery?