Ohm's law states that I = V/R. This law can be used to determine the amount of current I, in amps, flowing in the circuit when a voltage V, in volts, is applied to a resistance R, in ohms.
a. If a hairdryer set on high is using a maximum of 8.33 amps on a 120-volt line, what is the resistance in the heating coils?
b. In the United Kingdom, power lines use 240 volts. If a traveler were to plug in a hairdryer, and the resistance in the hairdryer was the same as in 12a, what would be the flow of current?
c. The additional current flowing through the hairdryer would cause a meltdown of the coils and the motor wires. In order to reduce the current flow in 12b back to the value in 12a, how much resistance would be needed?