





Ampere 

The unit of measurement of electrical current flow (see Current). 


Battery 

A group of individual cells connected together to provide the required voltage. 


Capacitor 

An electronic component that can store energy. 


Cell 

A single unit of a battery. 


Circuit 

A group of components powered by a voltage source to perform a specific task. 


Conductor 

A material that allows the flow of electrical current. 


Current 

The movement of electrons through a conductor. 


Insulator 

A material which doesn't conduct electrical current. 


LED 

A semiconductor device that emits light when an electrical current is applied. 


Load 

A device, component or system to which a voltage is applied . 


Ohm 

The unit of measurement of resistance. 


Ohm's Law 

The relationship between voltage (E), current (I) and resistance (R) in a circuit. 


Parallel Circuit 

A circuit that has more than one continuous path for electrons to flow. 


Photon 

A particle of light. 


Photovoltaic Effect 

The generation of an electrical current by a photosensitive device. 


Resistance 

The opposition that a material offers to the passage of an electric current, measured in ohms. 


Resistor 

An electronic component designed to oppose an electric current. 


Schematic Diagram 

Illustration of a circuit with the components represented by their symbols. 


Semiconductor 

A solid material that has electrical conductivity in between a conductor and an insulator. 


Series Circuit 

A circuit that has a single path for electric current to flow through all of its components. 


Voltage 

The electrical entity which is the cause of current flow. 


Volt 

The unit of measurement of electromotive force. 


Watt's Law 

The unit of measurement for electrical power, P = V x I where P is the power in watts, V is the potential difference in volts and I is the current in amperes. 