Fuse
Safety device that prevents too much current flowing through the circuit. Too much current the fuse will melt and break making the circuit incomplete and stopping the flow of electrons
Cell
Supplies electrical energy. The lighter (on the left) is positive
Battery
Supplies electrical energy. A battery is more than one cell
Power pack
Supplies electrical energy. Voltage can be set to a desired value
Wire
To pass current very easily from one part of a circuit to another
Switch
An on-off switch allows current to flow only when its is in the closed (on) position
Lamp
A lamp converts electrical energy to light
Resistor
A resistor restricts the flow of current and changes electrical energy to heat energy
Rheostat ( Variable Resistor )
A Rheostat is usually used to control the current in a circuit
Voltmeter
A voltmeter is used to measure voltage
Ammeter
An ammeter is used to measure current
Ohmmeter
Used to measure resistance. Most measure resistance