Electricity and magnetism

Question 1

what is electrical energy

Answer 1

• type of kinetic energy
• produced by charged particles
• highly convienient

Question 2

what is electricity

Answer 2

electricity is the movement of particles from negative to positive

Question 3

what is static electrcity

Answer 3

imbalance of electrical charges that build up on the surface of an object

Question 4

what is current electricity

Answer 4

flow of electrons through an electrical conductor

Question 5

what is a conductor

Answer 5

material where some electrons are free to move and can flow in an electric current

Question 6

what is an insulator

Answer 6

material where electrons are tightly held and cannot move so electric current cant flow

Question 7

what is an electrical circuit

Answer 7

electrical circuit is a path for electrical charge to flow through

Question 7

what does static electricity do

Answer 7

builds up when two insulating materials are rubbed together like plastic comb and hair.

Question 8

what is a series circuit

Answer 8

one pathway for electrons to flow

Question 9

what do circuits need

Answer 9

• energy supply (cell or battery of cells)
• component to transfer electrical energy into another form (bulb)
• complete unbroken pathway fro electrons to flow (copper wires)

Question 10

what are the components of a circuit

Answer 10

• cell
• battery
• wire
• switch
• bulb
• ammeter
• voltmeter
• resistor

Question 11

what is a parallel circuit

Answer 11

more than one pathway for electrons to flow

Question 12

what is current

Answer 12

current is a measure of flow of electrical charge in circuits

Question 13

what is current measured in

Answer 13

measured in Amps (A) using an ammeter

Question 14

what is electron flow

Answer 14

charge carried by electrons from the negatice terminal to the positive terminal

Question 15

what is current in series

Answer 15

te current is the same in all parts of a series circuit

Question 16

what is current in parallel

Answer 16

current is shared in parallel

Question 17

what is voltage

Answer 17

amount of energy provided to electrons that flow through the circuit (push required to move electrons)

Question 18

what is voltage measured in

Answer 18

measured in Volt (v) using voltmeter

Question 19

what is voltage in series

Answer 19

in series voltage is shared

Question 20

what is voltage in parallel

Answer 20

in parallel circuit voltage is the same

Question 21

what is Power

Answer 21

how much energy is transferred from one form to another in a one second

Question 22

what is power measured in

Answer 22

measured in Watts (W)

Question 23

how to calculate power

Answer 23

Power=work/time
or
power = voltage x amps

Question 24

what is cost of energy measured in

Answer 24

measured in kilowatt-hours

Question 25

how to calculate cost of energy

Answer 25

power rating in KW x time in hours = total amount of energy used (KW x hours=kwh

Question 26

how to calculate cost of electricity

Answer 26

total Kwh x price of one KwH = total cost (cost = KwH x $/kwH)

Question 27

what is resistance

Answer 27

measure of how easy it is for current to flow in a circuit

Question 28

what is resistance measured in

Answer 28

measured in ohms

Question 29

what are magnetic materials

Answer 29

Iron, cobalt and nickel

Question 30

what are magentic attractions for opposite and like poles

Answer 30

- opposites attract - like repel

Question 31

what is inside a magnet

Answer 31

small regions called domains that line up the same way.

Question 32

what do domains do

Answer 32

give magnets magnetic polarity

Question 33

What is magnetic strength measured in

Answer 33

measured in Tesla (T)

Question 34

how do you make a magnet

Answer 34

1. collect a magnet and pin 2. rub the pin with a magnet in ONE direction 3. use a pin to pick up paper clips

Question 35

How do you test magnet strength

Answer 35

test how many paper clips the magnet can lift from a surface.

Question 36

what is static electricity used for

Answer 36

photocopiers or air filters

Question 37

why is static electricity dangerous

Answer 37

becacaue you can get an electric shock due to the flow of current through the body,

Question 38

what do you do in an electrical accident

Answer 38

- dont touch the injured person if they are still in contact with a live source of electricity. - Switch the power off, either at the source or at the main power switch. - Phone for an ambulance immediately, dial 111.

Question 38

Law of Conservation of Charge

Answer 38

the net charge of an isolated system will always remain constant.

Question 39

how do you make an electromagnet

Answer 39

wrapping a wire around an iron nail and running current through the wire. Connect to battery