Electrical Gadgets Revision

Question 1

Define what static electricity is.

Answer 1

Its created when positive and negative charges aren’t balanced.

Question 2

What is current electricity?

Answer 2

Current is the flow of an electric charge within a conductor

Question 3

What are the differences between static and current electricity?

Answer 3

Current electricity is made by the flow of electrons down a conductor, where static electricity is caused by the build up of electrical charges on the surface of things.

Question 4

What is the interaction between electric charges called?

Answer 4

electric force

Question 5

How do objects become charged?

Answer 5

when two materials come into contact or are rubbed together.

Question 6

What is an example of electrical energy?

Answer 6

batteries, lightning, and electrical charges moving through a wire plugged into the wall socket to power electrical appliances such as televisions and computers.

Question 7

Name 3 types pf electrical energy.

Answer 7

electrical, chemical, heat

Question 8

What is a conductor?

Answer 8

a substance or material that allows electricity to flow through it.

Question 9

What is an insulator?

Answer 9

a material that doesnt allow energy flow through it

Question 10

What is an electric current?

Answer 10

the flow of electricity in an electronic circuit, and to the amount of electricity flowing through a circuit

Question 11

What does resistance mean?

Answer 11

a measure of the opposition to current flow in an electrical circuit.

Question 12

What does ohm’s law include?

Answer 12

V - voltage
I - current
R - resistance

Question 13

What is magnetism?

Answer 13

Magnetism is the force applied by magnets when they attract or repel each other

Question 14

Why is magnetism important?

Answer 14

because we use it to create electrical energy.

Question 15

Unlike poles ____, like poles _____

Answer 15

attract
repel

Question 16

Define voltage, current, resistance and power.

Answer 16

Voltage - the “pressure” that pushes electricity
Current - flow of electricity
Resistance - the amount that an object impedes or resists in an electric current
Power - time rate of doing work or delivering energy,

Question 17

What are the units for voltage, reistance, power and current?

Answer 17

V
ohms/Ω
W
A

Question 18

Explain why a circuit with one bulb has more voltage than circuits with more bulbs.

Answer 18

Because voltage gets shared lightbulbs, hence these bulbs have lower voltage than the circuit.

Question 19

Anmeters and voltmeters have to be in which circuit?

Answer 19

series
pararel

Question 20

What is an ammeter and a voltmeter?

Answer 20

Ammeters measure the current of a circuit
Voltmeters measure the voltage drop across a resistor

Question 21

Name reasons why parallel or series circuits are better to use for house wiring.

Answer 21

Parallel circuit:

Question 22

What does VIR, PIV, DVT, represent and what is its purpose?

Answer 22

VIR: to find voltage, current and resistance.
PIV: to find power, current, and voltage
DVT: to find distance, velocity and time.

Question 23

What type of particles moves the balloon when rubbed onto the jersey?

Answer 23

electrons

Question 24

What type of electricity allows balloons to stick to the jersey?

Answer 24

static electricity

Question 25

If theres 2 balloons, and one moves away, why is that?

Answer 25

because they are rubbed off, meaning there is positive and negative charges - they repel each other, making one move away.

Question 26

What does FMA stand for and calculate?

Answer 26

to find force (N), mass (kg), and acceleration (ms-2)

Question 27

Explain what a series and parallel circuit is.

Answer 27

A series circuit contains a path along which the whole current flows through each component
A parallel circuit contains branches so that the current divides and only part of it flows through any branch.