OHM'S LAW

Ohm's Law explains how the potential difference or voltage of a current source, an electrical current, and the resistance of a circuit interrelated.
Ohm's Law states: if the voltage in a circuit is increased, the current in the circuit will go up, and if the voltage is lowered, the current will go down. For example, if the voltage is doubled, the current will be twice. Ohm's law also shows that if the voltage is kept constant, the smaller conductor resistance will result in bigger current and bigger resistance circuit will produce a smaller current.

The formula for Electric Current 

Using Ohm's law, the electric current in a circuit can be determined by the equation:

         in which I stated the current, V voltage states, and R represents the resistance.
For a fixed resistance, if the voltage applied to circuit is increased, the current will rise, and the current will be lowered if the voltage down.

V up, I up V down, I down

For a fixed voltage, if the resistance in the circuit is increased, the current will down, and if the resistance is lowered, the current will go up.

R up, I down R down, I up

The formula for the potential difference / voltage

The formula for resistance

*  Examples of question and the solution:

Electric current flowing through a wire 2A conductor when a potential difference of 12 V is given by the edges. Determine the electrical resistance on the wire?

Known :

I = 2A                              Jawab :  R  = V/I

V= 12 V                                             = 12/ 2

Ask : R ..... ?                                      = 6 ohm