Electricity Flashcards
State the Law of Electric Charges
1) Opposite charges attract
2) Like charges repel
3) Charged and neutral objects attract
Distinguish between an insulator and a conductor and provide two
examples of each.
1) Insulator - Resists electrical flow = Rubber, plastic, and glass.
2) Conductor - Allows electrons to flow = Aluminum, silver, and iron.
Distinguish between static electricity and current electricity.
Static electricity is stationary electric charges that are on the surface of an object. Whereas, current electricity is electric charges in motion within a conductor.
List the four parts of a simple circuit and give examples of each.
1) Load = Lightbulb
2) Connectors = Wires
3) Source = Battery
4) Control device = Switch
In a circuit, electric charges flow from the ______ terminal to the
______ terminal
Negative terminal to positive terminal
What are the uses of each electrical component:
1) Cell
2) Battery
3) Switch
4) Fuse
5) Ammeter
6) Voltmeter
7) Resistor
8) Load
9) Connector
1) Cell = Power source
2) Battery = Power source
3) Switch = To control the current through a circuit
4) Fuse = Protects against surges
5) Ammeter = Measures current
6) Voltmeter = Measures the potential difference across a load
7) Resistor = Resits current
8) Load = A component that uses the electrical energy to perform a task
9) Connector = Connects the components of a circuit.
Define resistance.
Resistance slows down the flow of electrons.
Which of the following would have the higher resistance in a circuit: the conducting
wire or the light bulb? Explain.
The lightbulb would have the higher resistance because it slows down the current to convert the electrical energy into heat or light
What is the advantage of connecting circuits in series? In parallel?
Circuits in series require less material, and the current stays the same throughout. If one part of a parallel circuit fails, the rest will still work.
Define, current, voltage, and resistance.
Current - The number of electric charges flowing past a fixed point per second.
Potential difference - The difference of electric potential energy per unit of charge, at 2 point in a circuit.
Resistance - The ability to resist the flow of electrons in conductors.
What is Ohms Law?
V = I x R
R = V / I
I = V / R
What is a short circuit? What device protects your house from electrical fires?
- A short circuit is when electric current flows down the wrong path with little to no resistance.
- Fuse or circuit breaker.
What are the 3 methods of charging an object?
1) Charging by friction
2) Charging by contact
3) Charging by induction
