Ohm’s law was experimentally determined by George Simon Ohm: who determined that the amount of current transmitted along a wire is directly proportional to the cross-sectional area of the wire and inversely proportional to its length. Using these results he discovered and defined resistance and illustrated the relationship between voltage, resistance, and current. In this post, you’ll learn all the important points about Ohm’s Law.
Contents
Statement of Ohm’s Law
The electric current flowing through a pure resistor is directly proportional to the applied voltage.
Mathematically, V ∝ I … (Ohm’s law statement)
We can also express Ohm’s law in terms of current, voltage, and resistance:
The potential difference (voltage) across any resistor equals the product of current times resistance.
V = IR … (Ohm’s law statement)
where
V = Voltage in volts (V)
I = Current in amps (A)
R = Resistance in ohms (Ω)
Ohm’s Law Solved Example Problems With Solutions
Statement: A 5 ohms resistor has 2 Amps of current passing through it. Find the value of voltage soure.
Solution: From formula V = IR = 2 A * 5 ohms = 10 V
Practice Problems Set
How to apply Ohm’s Law on Series Resistors
The application of Ohm’s law on series resistors is shown below:
