Resistance

The difficulty that a charge has in moving around a circuit (resistance is measured in ohms)

A substance that allows electricity to move through it easily

A component that controls the amount of current in a circuit.

A light emitting diode

Type of material *Copper (Low Resistance, High Current) *Nichro (High resistance, Low current) Length of conductor *Long (High _ Low) *Short (Low _ High) Thickness of conductor *Thick (Low _ High) *Thin (High _ Low) Temperature of conductor *Hot (High _ Low) *Cold (Low _ High)

R= V/I

V=IxR

I= V/R

Used to protect the circuit and people from the heating effect of an electric current. (Consists of a thin wire that melts when the circuit gets too hot and it stops current)

Electrical switches that automatically turn off the flow of electrical current when an overload or short circuit is detected

Another safety device which becomes activated if a circuit is overloaded, the purpose of this is to protect people from injury or death. It limits the amount of current that can pass through the human body and the time for which it can pass.