Simply put, the law states that:

The electric current flowing through a conductor is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit.

This relationship is expressed by the formula:

V = R · I

Where:

• V is voltage (in volts – V)
• I is electric current (in amperes – A)
• R is electrical resistance (in ohms – Ω)

How to understand this?

• If we increase the voltage while the resistance stays the same, the current increases.
• If we increase the resistance while keeping the voltage the same, the current decreases.
• The behavior of the current always depends on the balance between voltage and resistance.

Practical applications of Ohm’s Law
Ohm’s Law is present in almost everything involving electricity. Some examples include:

• Sizing electrical wires and cables.
• Calculating the current that a device will consume.
• Choosing the correct resistors in electronic circuits.
• Understanding why certain devices heat up or burn when the voltage is inappropriate.

Simple example
If you have a lamp with a resistance of 20 Ω connected to a 10 V source, the current will be:

I = V / R = 10 / 20 = 0.5 A

This means the lamp will draw 0.5 amperes from the source.

Ohm’s Law Wheel

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