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Ohm's law is one of the most important concepts in electronics. Fortunately it's only a very simple mathematical relationship between current, voltage, and resistance.

According to the Ohm's law, voltage equals current times resistance which is expressed in the following equation:

E=IR
where E = voltage, I = current, and R = resistance

For example, if
I = 0.1A
R = 10k
 then
E = 0.1 * 10k

E = 1000 volts

Note: "k" stands for "thousands". So 10k = 10,000 ohm


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