Electricity

Electrical principles

• Electrical charge

• Positive and negative

Electrical circuit

• Source of energy

• Unbroken path

• A load (energy is used)

Electrical Units

• Electrical current– The Amp ‘A’

• Electrical Voltage– The Volt ‘V’

Electrical Power

• Electrical Resistance– The Ohm ‘’

• Electrical Energy– The Watt ‘W’

• Electrical Power– The Kilo Watt Hour ‘KwH’

Types of Current

• Alternating Current (AC)

• Direct Current (DC)

• Earthing

Electrical Components

• Batteries

• Conductors

• Insulators

• Switches

• Electromagnets

Morse code

• 1839 The worlds first commercial telegraph was built between Paddington and West Drayton. This was also the first commercial use of electricity.

• 1843 Samuel Morse used electricity and it's electro-magnetism effect to send messages between Washington and Baltimore in the USA.