Ohm’s Law is a relationship between the voltage, current and resistance of a resistor:
V = I R
where:
V = voltage across the resistor (in volts or V)
I = the current through the resistor (in amps or A)
R = the resistance of the resistor (in ohms or Ω).
The current through the resistor in the diagram at right is 2A. The resistance of the resistor is 3Ω. Using Ohm’s Law, the voltage across the resistor is:The current through the resistor in the diagram at right is 2A. The resistance of the resistor is 3Ω. Using Ohm’s Law, the voltage across the resistor is:
V = IR = (2A)(3Ω) = 6V.