Grade 9 Unit 3 Electricity and Magnetism (Electric Charge and Static…
Grade 9 Unit 3 Electricity and Magnetism
Electric Charge and Static Electricity
What affects the electric force between two objects?
Like charges repel each other, unlike charges attract each other.
The closer together the charged objects are, the greater the electric force is.
How can an object become charged?
Rubbing a balloon on your hair moves electrons from your hair to the balloon.
If a charged object and uncharged object touch each other, the charged object can transfer some of its charge to the area it touches.
Charges can be arranged within a object without touching it.
What materials affects the flow of charges?
Copper is a metal that is used to make wires because it is an excellent electrical conductor.
Plastic is often used to coat wires because electric charge cannot move through the plastic easily.
It is used to make computer chips found in electronic devices.
What are the two kinds of current?
Direct current (DC)
Charges move in one direction in DC
Alternating current (AC)
Charges repeatedly change direction in AC
What affects electric current?
Voltage can measure the electric potential energy per unit charge.
Higher resistance at the same voltage results in lower current.
What affects electrical resistance?
What are the parts of an electric circuit?
Conducting wires connect all the parts of an electric circuit.
An energy source converts some type of energy, such as chemical energy, into electrical energy.
Examples of load includes light bulbs, radios, computers, and electric motors.
How do series circuits and parallel circuits differ?
In series circuits, charges follow a single path.
In parallel circuit, charges follow multiple path.