: a very large amount or number: an amount that is much greater than what is necessary. A plethora of books have been written on the subject. a plethora of information. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. a very large amount or number: an amount that is much greater than what is necessary. A plethora of books have been written on the subject. a plethora of information. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples.
Ohm's law defines the relationship between the voltage, current, and resistance in an electric circuit: I = V / R. The current is directly proportional to the voltage and inversely proportional to the resistance.
Report Abuse. Hi, Benjav, An ohmmeter measures the resistance of a circuit, but it can't do that directly. So it applies a voltage across the circuit and measures the current that flows. Ohm's law states the voltage is equal to the current multiplied by the resistance (V = IR), so it can calculate the resistance from the known voltage and current.