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Ohm’s Law and Joule’s Law
1. How much current is drawn from a 12 volt battery when a 150  resistor is connected
across its terminals?
2. A 1.5 V battery is connected to a light bulb whose resistance is 2.0 . How many
electrons leave the battery per minute?
3. What voltage must a battery have to produce 0.5 A of current through a 2.0 
4. An appliance is rated for 2.5 A at 120 V.
a. How much electric power does it require?
b. What is the effective resistance of the appliance?
5. A hair dryer is rated for 1200 W at 120 V.
a. How much current does the dryer draw?
b. What is the resistance of the dryer?
6. Two resistors of 100  and 25 k are rated for maximum wattages of 1.5 W and 0.25
W respectively. What is the maximum current for each?
7. What is the maximum power consumption of a 9.0 V transistor radio that draws a
maximum of 400 mA of current?
8. A toaster that draws 5 amps of current when plugged into a 120-volt wall socket.
a. What is the resistance in the toaster?
b. How much energy is used if the toaster is on for 2.0 minutes?
9. How much resistance is in a light bulb that draws 0.3 amps of current when attached
to a 1.5-volt "D" battery?