Yr 9 Electricity

Question 1

AC Meaning

Answer 1

Alternating Current, switches direction 50 times per second

Question 2

DC Meaning

Answer 2

Direct Current, flows from negative to positive

Question 3

Series Circuit

Answer 3

Circuit connected in sequence, only one path

Question 4

Parallel Circuit

Answer 4

Circuit with components connected in parallel with multiple paths

Question 5

Advantages of Parallel Circuits

Answer 5

Full voltage goes to each component in parallel rather than splitting the voltage like in series circuits. Can turn each component in the circuit on and off individually and it is easier to troubleshoot for this reason

Question 6

Voltage

Answer 6

Pressure or force that pushes electrons down a conducting path

Question 7

Current (Amperage)

Answer 7

The amount of electrons, grouped in coulombs, passing through a given point per second

Question 8

Resistance

Answer 8

A measure of how difficult it is for electricity to flow through a certain material

Question 9

Voltmeter

Answer 9

Measures voltage, should never be in the flow

Question 10

Ammeter

Answer 10

Measures current, should be in the flow

Question 11

Ohms Law

Answer 11

V = IR

Question 12

How to calculate Power and what is it measured in?

Answer 12

VI, measured in watts

Question 13

Black Coal

Answer 13

Older, low water content, higher in value, mor chemical potential energy, less pollution

Question 14

Brown Coal (lignite)

Answer 14

Cheap, high water content, must be dried, more pollution

Question 15

3 Amps = ? coulombs per second

Answer 15

3

Question 16

What is electricity and how does it work?

Answer 16

Metals often have only a few electrons in the outer shell which aren’t as tightly bound. These electrons can swap places with the electrons of other atoms. When force is applied the electrons will travel across to other atoms freely creating an electric current

Question 17

What is a coulomb?

Answer 17

A group of electrons, used as a form of measure

Question 18

How do electric motors work?

Answer 18

When a wire carrying a current is placed in a magnetic field there is a force. One wire experiences upwards force while the other wire experiences a downwards force as it is travelling the other direction. When connected in a coil this causes it to spin.