: 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.
Example. Calculate the resistance in ohms of a resistor when the voltage is 5 volts and the current is 0.2 amps. The resistance R is equal to 5 volts divided by 0.2 amps, which is equal to 25 ohms: R = 5V / 0.2A = 25Ï.he current I is equal to the voltage V divided by the resistance R (ohm's law): I = V / R. So the power P is equal to. P = V Ã V / R = V 2 / R. So the resistance R in ohms (Ï) is equal to the square value of voltage V in volts (V) divided by the power P in watts (W):