If the current is 0.26 A and the potential difference (voltage) is 6.0 V, then what is the resistance?

Expert Answers
t-nez eNotes educator| Certified Educator

You can solve this problem using Ohm's Law, which states that the electrical current through a conductor is proportional to the voltage drop across the conductor and inversely proportional to the resistance of the conductor. Mathematically, Ohm's law is V=IR, where V = potential difference or voltage drop, I is current and R is resistance. 

Rearranging the equation, we get:

R = V/I

R = 6 V/0.26 A = 23 ohms 

The ohm is the S.I unit of electrical resistance. One ohm is defined as the resistance between two points in a circuit when a potential difference of one volt across the resistance produces a current of one amp. An ohm is one volt/amp.

Resistance is the amount by which the electrical current through a device is reduced. A common analogy is that of water running through a pipe. If the pipe narrows the flow of water decreases, just as the flow of electricity in a circuit decreases when resisitance increases. Some factors that influence resistance in a conductor are its thickness, length and type of material.