Two kinds of loop – two patterns

The rope loop and the electrical loop behave in the same way. You can think about the rope loop easily and use this thinking to predict what will happen in the electrical loop.

First pattern — current and flow

In the rope loop, the flow is set by your pulling and your friends grabbing.

pullgrab = flow

In the electrical loop, the current is set by the voltage of the battery and the resistance of the bulb.

voltageresistance = current

Second pattern — glowing and warming

In the rope loop, the flow and the push set the warming. Because you don't get something for nothing, this also sets your running-down.

running-down = flow × pull

In the electrical loop, the current and the voltage set the glowing. Because you don't get something for nothing, this also sets the battery's running-down.

running-down = current × voltage