: 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.
That is called Ohm's Law. Ohm's Law describes the behavior of a theoretical circuit element called a resistor which usually has a constant value of resistance. Actual resistors (and actual conductors) behave very much like the theoretical model. Changing the current through a resistor does not have any effect on the resistance. If the current goes up, then according to Ohm's law, the voltage must have gone up in the same proportion. There is a circuit element called a variable resistor (a.k.a., potentiometer, or rheostat).