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Lamp
An electrical current heats the filament in a bulb so that it gives out light.
Voltmeter
the voltmeter measures voltage (potential difference) across two points.
Ammeter
Used to measure the current in a circuit
LDR
resistor whose resistance decreases with increasing light intensity
Thermistor
The resistance of a thermistor depends on its temperature. At low temperatures, the thermistor has a high resistance. As the temperature increases, the resistance decreases.
Variable resistor
Moving the position of the slider on this resistor, changes the resistance. A variable resistor is used in some dimmer switches and volume controls.
Diode
a circuit component that only allows current to flow in one direction
LED
a light-emitting diode
Fuse
breaks the circuit if a fault in an appliance causes too much current to flow
Cell
An electrical cell converts chemical energy into electrical energy, allowing current to flow from positive to negative terminals.
Battery
A device that stores and provides electrical energy through a chemical reaction, consisting of one or more cells connected together.
Closed switch
A switch that allows current to flow through a circuit when in the 'on' position.
Open switch
A switch that prevents current from flowing through a circuit when in the 'off' position.
Note 
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