Resistance Calculations:
Ohm's law can be used to find resistance among two points in a dc circuit when the voltage and the current are known.
PROBLEM:
When the voltmeter reads 24 V and the ammeter shows 3.0 A, Compute the value of the potentiometer?
SOLUTION:
By using the formula R = E/I, and putting the values directly as they are expressed in volts and amperes, we get:
R = 24/3.0 = 8.0 ?.