Voltage: V = R x I (Voltage = Resistance*Current)
Current: I = V / R (Current = Voltage/Resistance)
Resistance: R = V / I (Resistance = Voltage/Current)
Ohm's law can be used to calculate the resistance of an unknown circuit.
The most obvious case is when the circuit consists of only one wire.
Another situation arises when the resistance of the circuit is very high compared to the resistance of the wires within the circuit.
A third situation occurs when the circuit contains no resistive elements.
The temperature can also have an impact on the resistance.
Finally, the resistance of some materials depends upon their orientation relative to the direction of current flow.
