Grade 9 Elec Flashcards
Static Electricity
The build up of electric charges. The charge is stationary, meaning the charge stays where you put it
Charging by friction
The movement of electrons from one object to another. Gains electrons: becomes negative, loses electrons: becomes positive
Charging by contact
When a negative object comes in contact with a charged object. When the objects touch, the neutral object gets the same charge as the charged object.
Charging by induction
Putting a temporary charge on a neutral object using a charged object (objects do not touch). <=>opposites attract<=>
Electrostatic series
Weak hold ==> Strong hold on electrons
Acetate, glass, wool, fur, silk, cotton, ebonite, plastic, rubber, gold
Good uses of the electrostatic series
Photocopying, air purifiers, electrostatic painting (on cars)
Bad things coming from the electrostatic series
Getting shocked, hair to sweater, lightning, static cling in dryer
Insulators
Prevents the flow of electrons from flowing through itself
Conductors
Allow the electrons to flow easily through itself
How does an electroscope work?
An electroscope is used to find out if an object is charged or neutral. If the object is charged, the leaves will repel. This is because the opposite charge in the electroscope than the charge of the object are attracted to each other. The opposite charge moves up to the top of the electroscope, so the leaves have the same charges (they are no longer neutral). Therefore, the leaves repel.
Laws of electric charges
Like charges repel, unlike charges attract, charged objects attract neutral objects
Current electricity
The flow of electric charges through conductors in a circuit.
How is electricity produced in Ontario?
Coal, Hydro, Gas, Wind, Solar, Biofuel
What is current?
Current is the rate in which electrons move past a given point in the circuit
What is voltage?
Potential difference is the amount of energy decrease in the loads.
