component

• Cell

  Used to push electrons around the circuit
• Battery

  A number of cells joined together, used to push electrons around the circuit
• Bulb

  Lights up when current passes through it, so can be used to indicate that current is flowing through the circuit
• Switch

  Enables the current in a circuit to be switched on or off
• Fixed resistor

  Limits the amount of current flowing in a circuit
• Variable resistor

  Allows current in a circuit to be varied
• Ammeter

  Measures the current in a circuit
• Voltmeter

  easures potential difference (voltage) across a component in a circuit
• Diode

  Allows current to flow through a circuit in one direction only
• Thermistor

  Used as a temperature senser in a circuit, as the temperature increases the resistance of the thermistor decreases
• Light-emitting diode (LED)

  Emits light when a current passes through it