Electricity

Question 1

How are magnetism and electricity related?

Answer 1

electric current field makes a magnetic field and vice versa

Question 2

What is an electromagnet?

Answer 2

electric powered magnets

Question 3

How do electromagnets work?

Answer 3

they can be turned on and off

Question 4

How can the strength of an electromagnet be increased?

Answer 4

1. increase the number of coils 2. increase the voltage of the current

Question 5

Give an example of everyday magnets that use electromagnetism.

Answer 5

scrap yard cranes - sort out scrap metal at junk yards and recycling plants. A large magnet on the end of a crane can be turned on and off to pick up and drop large pieces of scrap metal.

Question 6

List 5 electricity safety rules

Answer 6

1. don’t put metal in toasters
2. Take plug-ins out of the the socket using the plug not the wire
3. Never put your fingers in an empty socket
4. Do not fly kites near electrical wires
5. Never touch electrical items when in contact with water

Question 7

Current

Answer 7

the flow of energy/electricity

Question 8

electricity

Answer 8

the flow and movement of electrons

Question 9

battery

Answer 9

a power source where chemicals react to make electricity

Question 10

proton

Answer 10

are positively charged and found inside the nucleus

Question 11

neutron

Answer 11

are neutral and also found inside the nucleus

Question 12

electron

Answer 12

negatively charged and and orbit around the nucleus

Question 13

insulator

Answer 13

a material that does not let electrons flow through it

Question 14

examples of insulators

Answer 14

rubber, glass, plastic

Question 15

conductor

Answer 15

a material that allows electrons to flow through it

Question 16

examples of conductors

Answer 16

copper, gold, people, animals

Question 17

open circuit

Answer 17

when there is a break that interrupts the flow of electricity (switched off)

Question 18

closed circuit

Answer 18

when there is a complete circuit allowing a continuous flow of electricity (switch on)

Question 19

switch

Answer 19

a device that opens and closes a circuit

Question 20

anode

Answer 20

the negative end of a battery

Question 21

cathode

Answer 21

the positive end of a battery

Question 22

resistor

Answer 22

a material that slows down the flow of electrons - used to control the current of electricy

Question 23

What are two possible outcomes when there are too many loads and not enough voltage?

Answer 23

1. some or all of the loads may not get their power

2. the circuit could short out/overload the circuit

Question 24

Static Electricity

Answer 24

a build up of an electric charge on the surface of a material

Question 25

Why is this called static electricity

Answer 25

it is not a continuous current or flow of electrons, static means motionless

Question 26

Why is static electricity not a good source of power

Answer 26

it is a very quick transfer of electricity that does not last very long

Question 27

How does lightning work

Answer 27

raindrops and ice crystal collide inside a rain cloud creating electrical charges. The electrons move to the bottom of the cloud, the protons move to the top. Negative charges build up at the bottom of the cloud. Positive charges build up on the ground creating a large electric field. Step leaders snake down from the clouds, streamers surge up creating lightning