They do this by changing the length of some resistance wire in a circuit. The circuit diagram below shows a variable resistor being used to control the current through a bulb. One connecting wire ...

To determine the voltage, current and resistance of an electric circuit. Ohm's law can be used to calculate the power dissipated in a circuit. In circuits with multiple components, it is important ...

Superconductivity is an advantageous property observed in some materials, which entails an electrical resistance of zero at ...