Concept explainers
Ohm’s Law: says that when electric current is flowing across a resistor, the current i, measured in amperes, can be calculated from the voltage v, measured in volts, and the resistance R, measured in ohms. The relationship is given by
a. A resistor in a radio circuit is rated at 4000 ohms.
i. Find a formula for the current as a function of the voltage.
ii. Plot the graph of i versus v. include values of the voltage up to 12 volts.
iii. What happens to the current when the voltage increases?
b. The lights on your car operate on a 12-volt battery.
i. Find a formula for the current in your car lights as a function of the resistance.
ii. Plot the graph of i versus R. We suggest a horizontal span here of 1 to 25.
iii. What happens to the current when the resistance increases?
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