Ohm’s Law

Ohm’s Law is the named after the German scientist Georg Ohm who in the 1820s conducted experiments investigating the relationship between potential difference and current on various lengths and types of metal conductors.

The findings of his experiments led to Ohm’s Law which states:

The current flowing through a metallic conductor held at constant temperature is directly proportional to the potential difference between the ends

In other words, if the current doubles the potential difference doubles or if the current triples the potential difference triples.

Ohm’s Law can also be stated for the current through a resistor as:

The current flowing through a resistor held at constant temperature is directly proportional to the potential difference across the resistor

The relationship between potential difference, current and resistance is given by the equation:

Potential Difference or Voltage (V)
= Current (I) x Resistance (R)

V = I x R

 

Learn this equation and practice questions requiring the use of this equation.