Current ElectricityCurrent Electricity

Mr. M. CouturierMr. M. Couturier

SNC1DSNC1D

Current ElectricityCurrent Electricity

Current ElectricityCurrent Electricity

Unlike static electricity which resides Unlike static electricity which resides on the surface of an object on the surface of an object (stationary) and will not move until a (stationary) and will not move until a (usually an uncontrollable and (usually an uncontrollable and unpredictable) discharge occurs; unpredictable) discharge occurs; current electricity flows through a current electricity flows through a material, usually a conductor, in a material, usually a conductor, in a controlled manner. controlled manner.

Current ElectricityCurrent Electricity

The most common use of current The most common use of current electricity is through insulated electricity is through insulated copper wires which send a constant copper wires which send a constant flow of electricity from one point to flow of electricity from one point to another.another.

Current ElectricityCurrent Electricity

In order for a flow of current In order for a flow of current electricity to occur, a closed circuit electricity to occur, a closed circuit must exist so that a continuous path must exist so that a continuous path of electrons can pass. This is called of electrons can pass. This is called an electrical circuit.an electrical circuit.

http://health.howstuffworks.com/humahttp://health.howstuffworks.com/human-body/systems/circulatory/adam-2000n-body/systems/circulatory/adam-200078.htm78.htm

LOADLOAD

One of the main components of an One of the main components of an electrical circuit is a load. This electrical circuit is a load. This device converts electrical energy device converts electrical energy energy into other forms of energy energy into other forms of energy such as:such as:

– Mechanical energy (fan, pump, lift)Mechanical energy (fan, pump, lift)– Thermal or photonic energy (stove, Thermal or photonic energy (stove,

heater, lightbulb)heater, lightbulb)

SWITCHSWITCH

Current electricity is controllable Current electricity is controllable partly because a switch is included partly because a switch is included within electrical circuit. A switch is within electrical circuit. A switch is either ON (or open or 1) or OFF (or either ON (or open or 1) or OFF (or closed or 0). The use of 0 and 1 is closed or 0). The use of 0 and 1 is intended to illustrate binary language intended to illustrate binary language which is essential for electrical and which is essential for electrical and computer engineering. computer engineering.

SOURCESOURCE

In order to PUSH the electrons into In order to PUSH the electrons into such that they flow in a current, we such that they flow in a current, we need a source of energy within the need a source of energy within the electrical circuit:electrical circuit:

– A battery (chemical energ)A battery (chemical energ)– Solar panelsSolar panels– Generators (chemical, nuclear, Generators (chemical, nuclear,

hydro, thermal)hydro, thermal)– WindmillsWindmills

CONNECTORSCONNECTORS

Since the electrical circuit MUST be Since the electrical circuit MUST be completely connected to all its completely connected to all its components, it requires connections components, it requires connections in the form of electrical wires (for in the form of electrical wires (for now) or conducting wires. now) or conducting wires.

– Thought – imagine if energy could Thought – imagine if energy could be transmitted in a CONTROLABLE be transmitted in a CONTROLABLE wireless manner – no more wireless manner – no more wires!!!!!! wires!!!!!!

IN A NUT SHELLIN A NUT SHELL

To create an electrical circuit you To create an electrical circuit you need:need:

– A load (i.e. a toaster, a fridge)A load (i.e. a toaster, a fridge)– A source (i.e. battery)A source (i.e. battery)– A switch (if it is to be controlled)A switch (if it is to be controlled)– A connection to all the above (wires)A connection to all the above (wires)

HomeworkHomework

Read 12.1 Introducing Current Read 12.1 Introducing Current Electricity (pages 507 – 508)Electricity (pages 507 – 508)

Do questions 1-6Do questions 1-6