Circuits

Simple circuit consisting of a Voltage source and a resistor.

A battery on it's own is a voltage source, however, if nothing is connected between the + and -, no current will flow.

The simplest circuit one can imagine consist of a voltage source and a resistor.

You can play with this circuit in CircuitJS by clicking here

In any circuit, there exists a fixed relationship between the voltage, the resistance and the current. This is expressed by Ohm's Law, which states:

U = R x I