One the most important and fundamental laws of electronics is that of Ohms law. This law defines the relationships between current, voltage, and resistance. In this activity, you will learn about Ohm's law.

One of the most important and basic laws of electrical circuits is Ohm's law, which states that:

German scientist Georg Simon Ohm worked with electricity. He was able to prove a mathematical link between voltage (V), current (I), and resistance (R). The unit for resistance, the ohm, was named after him.

 

What is voltage?

Voltage is the difference in charge between two points in an electrical field.

What is current?

Current refers to the quantity, volume, or intensity of electrical flow (as opposed to voltage, which refers to the force or "pressure" causing the current flow).

What is resistance?

Resistance is an electrical quantity that measures how the device or material reduces the electric current flow through it. The resistance is measured in units of ohms (Ω).

All three of these —  voltage, current, and resistance —  directly interact in Ohm's law. Change any two of them and you affect the third.

 

Ohm developed a formula that can be used by those who design or work with circuits. He said that as long as two of the values are known, the third one can be figured out. 

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Let's take a look at an example for finding voltage (V = IR or V = I x R).

This formula may be used to calculate the number of volts in a circuit.