Ohm’s Law

1. The voltage necessary to force a given amount of current through a circuit is equal to the product of the current and the resistance of the circuit.

E = I*R

2. The current in a circuit is equal to the voltage applied to the circuit divided by the resistance of the circuit.

I=E/R

3. The resistance of a circuit is equal to the voltage applied to the circuit divided by the amount of current in the circuit.

R=E/I

Any of these equations can be represented by the following tool:

All one has to do is cover the value you want to find and the remaining symbols will be arranged in the form of the equation used to solve for it.

For example, if the objective is to find the value of EMF in a circuit, covering the E will leave I*R.

Also, if the value for current is required, cover the I and the equation E/R remains.

Lastly, cover the R to find the equation for solving for resistance and E/I is showing.