science 9
DESCRIPTION
Science 9. Aim: Current Electricity. Agenda. Science Sizzler ( A shton, 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 - PowerPoint PPT PresentationTRANSCRIPT
Science 9Aim: Current Electricity
Agenda1. Science Sizzler (Ashton,
Connor)2. Van de Graff Generator Demo3. Current Electricity4. Bill Nye or Magic School Bus5. Next class
Van de Graff GeneratorsA 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!!
The Steady Flow of Charged Particles is called an electrical current
This flow will continue if:
1) There is an energy source2) There is a complete circuit or
path for the particles to flow through
CURRENT ELECTRICITY
- - - - - - - - - - -
AmperesThe 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 EnergyThe energy carried by charged
particles
Transporting Current ElectricityNeed 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.
A
B
C
D
CircuitryCircuits 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
Voltage (aka – ‘Potential Difference’)
A measure of how much electrical energy each particle carries
Units = volt (V)
Measuring VoltageVoltmeters Red to Positive Terminal Black to Negative Terminal
SAFELY Working with ElectricityRead Pages 284 -287 & Answer questions 1 – 9 on 287
FOR MARKS!!