Ohm's Law

This note is explain how the amount of current I in a circuit depends on its resistance R and the applied voltage. Specifically, I = V/R, determined in 1828 by the experiments of George Simon Ohm. If we know any two of the factors V, I, and R, we can calculate the third. As an example, with 6V applied accros an R of 2 ohm, the I is 6/2 = 3 A. Ohm's law also determines the amount of electric power in the circuit. The amount of power consumed P in a circuit is equal to the voltage times the current (P = V x I). The power used by the R above is therefore equal 6 x 3 = 18 W. This relations apply to both DC and AC circuit.

Important terms in this note are:
volt
ampere
ohm
watt
joule
milli
micro
kilo
mega
linear graph
power
voltampere characteristic