Ohm Law

3D Model

Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperatures remain constant. Ohm’s law only holds true if the provided temperature and the other physical factors remain constant. In certain components, increasing the current raises the temperature. An example of this is the filament of a light bulb, in which the temperature rises as the current is increased.

V = IxR V (Voltage), I (Current) and R (Resistance)

If the value of voltage is asked and the values of the current and resistance are given, then to calculate voltage simply cover V at the top. Examples of how the magic triangle is employed to determine the voltage using Ohm’s law are given below. alculated using Ohm’s law and by substituting the values of voltage, current and resistance.

When does Ohm’s law fail? Ohm’s law may not give the desired results if the physical conditions such as temperature or pressure are not kept constant.