Ohms Law

Ohm’s Law

Ohm’s law is used to describe the relationship between Voltage (V),

Current (I) and Resistance (R). If you know any of two of these values it is

possible to calculate the third. Ohm’s law can be arranged in three ways

depending on what you want to calculate.

Ohm’s Law equation

V = I x RI = V / RR = V / I

Note: V = Voltage in Volts, I = Current in Amps, R = Resistance in Ohm’s

Ohm’s Law Triangle

Example Calculations

Voltage: I = 10amps R= 1 ohmWe use the equation V = I x RV = 10 x 1 therefore V = 10

Current: V = 12 volts R = 2 ohms We use the equation I = V/R I = 12/2 therefore I = 6

Example Calculations

Resistance:V = 100 volts I = 40 ampsWe use the equation R = V/I R = 100/40 therefore R = 2.5 ohms