So, Ohm's law tells you that if there's a 10V battery with 5 ohms resistance, the current is 2A. But here's the catch. 10V of electricity will make your wire get hot under the collar.

Look at it like this;

A runner is in a race. Their speed will be equal to the distance travelled divided by the time taken to travel that distance. However, maintaining that speed adds a new factor; the amount of energy the runner has. The runner can't keep up the speed and slows down. The distance travelled in a set time therefore changes. So he gets slower, bringing down distance travelled in that time. An outside factor has changed the rules.

The runner's speed represents the current, the distance travelled, the voltage and the time taken, the resistance. The example is showing how an external factor changes it up. The external factor we have here is heating of the wire from the current passing through it, increasing resistance. So its complicated.

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