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This photo is the best for me because it represents the 3 different ways of calculate the Ohm's law. Ohm's law is the relationship between voltage and current in an ideal conductor. This relationship states that voltage across the conductor is proportional to the current. The constant of proportionality is called the resistance, R. Ohm's law is given by V= R×I , where V is the potential difference between two points and V×I is the current flowing through the resistance.

The Ohm’s Law is a basic start for those who want to learn the electrical science