Electrical circuits are pathways where free electrons can move. The movement of free electrons is called a current. The force that moves electrons through a circuit is called a voltage. Opposition to the movement of free electrons is called resistance.
The formula E=IR can be used to calculate the relationship between voltage, current, and resistance in a circuit. There are three different versions of the formula that can be used to calculate voltage, current, or resistance.
E=Voltage (measured in Volts (V))
I=Current (measured in Amps (A))
R=Resistance (measured in Ohms (Ω))
I=E/R
E=IR
R=E/I
If a circuit has a resistance of 3Ω and a voltage of 12V what is the current of the circuit?
R=3Ω
E=12V
I=E/R is used to solve for current.
I=12V/3Ω
I=4A
The current of the circuit is 4A.
