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Science 9

Aim: Current Electricity

Agenda

- Science Sizzler (Ashton, Connor)
- Van de Graff Generator Demo
- Current Electricity
- Bill Nye or Magic School Bus
- Next class

Van de Graff Generators

- A tool used to study electrical discharge

What is Energy? Electrical Energy?

Energy

= ability to do work

Electrical Energy

= energy of charged particles

= transferred when electrons travel from place to place

Static Electricity is not useful in operating electrical devices…why?

Because charge particles are stationary(build-up & discharge).

Electrical devices need a constant flow of charged particles!!

CURRENT ELECTRICITY

- The Steady Flow of Charged Particles is called an electrical current
This flow will continue if:

1) There is an energy source

2) There is a complete circuit or pathfor the particles to flow through

- - - - - - - - - - -

Amperes

The rate at which an electrical current flows is measured in Amperes (A), or “Amps” for short

Some Perspective:

- Most home electrical devices
have a current of less than 15 A.

- A wristwatch uses a current of only a tiny fraction of ampere
- Generating station produces thousands of amperes

Electrical Energy

The energy carried by charged particles

Transporting Current Electricity

Need to get electricity from its source (ex. hydro dam) to where it will be used (ex. homes)

Materials that allow for an electrical charge through it easily are called CONDUCTORS

Circuitry

A circuit is a path that controls the flow of electricity.

In most electrical circuits, the path in which the electrons flow is made of solid metal wires…

…but circuits can also include gases, fluids, and other substances.

Circuitry

A

Circuits include:

A) An Energy Source

= Supplies electrons

B) A Conductor

= Material allowing flow of electrons

C) A Load

= A device that converts electrical energy to another form of energy (ex. heat or light)

D) A Switch (Optional)

= Closes and opens a circuit

B

D

Voltage (aka – ‘Potential Difference’)

A measure of how much electrical

energy each particle carries

Units = volt (V)

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