What does the electric force of two objects with the same charge do?
Repel each other
100
In a simple circuit, what is the source of electrical energy?
the battery
100
What happens if the path in a circuit is broken?
Electricty won't flow.
100
What are the two types of circuits we've dealt with in class?
Series and Parallel Circuits.
100
What is the charge of a nucleus in an atom?
Positive - it contains protons and neutrons
200
What is a positively and negatively charged atom called?
An ion
200
In a simple circuit, what serves as the electrical conductor?
the wire
200
What happens to a battery if it runs out of chemical?
It dies.
200
How many paths are there for a current to take in a series circuit?
One path
200
What happens when you add more bulbs to a circuit without adding more batteries?
You increase resistance, which decreases the current.
300
How can you increase the electric force acting on two objects?
Bring the objects closer together.
300
How do we measure voltage?
in volts
300
What is Ohm's Law?
Voltage = Current x Resistance
300
Describe one advantage of using a parallel circuit.
1. If one bulb goes, the others remain lit.
2. If more bulbs are added, they do not become dimmer.
300
Which have higher resistance: insulators or conductors?
Insulators
400
What is static electricity? Describe what happens to static discharge on a humid day.
1. the build up of charges on an object
2. less static discharge on humid day because water in air carries off the extra electrons
400
What is voltage?
a measure of how much electrical potential energy each electron can gain
400
What is resistance and how is it measured?
-the measure of how difficult it is for electrons to flow through material
-measured using Ohm's
400
Explain why you can add as many bulbs as you want in a parallel circuit without it affecting the brightness of the lights.
There are multiple paths so there is less resistance allowing more current to flow through.
400
Name 3 examples of good conductors.
Aluminum, Copper, Gold, Metals, etc.
500
Name and explain the 3 methods by which charges are transferred.
1. Friction - transfer of electrons by rubbing
2. Conduction - transfer of electrons by direct contact
3. Induction - movement of electrons to one part of an object by another electric field
500
What is electric current?
A steady flow of electric charge.
500
Explain how a battery works.
1. chemical reactions produce an electric field in the battery
2. this causes electrons to move from (+) to (-) terminals
500
Describe one advantage and two disadvantages of a series circuit.
Advantage - easy to design and build
Disadvantage - one break in the circuit causes all other bulbs to go out
Disadvantage - light bulbs become dimmer as you add more to the circuit because you are adding more resistance