Circuits
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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