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Flashcards in Electricity And Magnetism Deck (48)
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1

amps

Units of measuring electric current in a circuit, the symbol is A

2

current

The flow of an electric charge (electrons) around a complete circuit per second

3

Magnetic field

A region where there is a force on a magnet or magnetic material

4

atom

A neutral particle. Everything is made from them

5

In a series circuit with multiple ammeters at different points in the circuit, do all the ammeters show the same reading?

Yes

6

volts

Unit of measuring voltage, the symbol is V

7

Ohms

The unit of resistance, symbol is greek O

8

proton

A positive particle found in an atom

9

lightning

A current through the air that produces light and sound

10

Relay

Electrical device that uses current flowing through it in one circuit to switch on and off a current in a second circuit

11

motor

A component or machine that spins when a current flows through it

12

switch

A component that controls the current by making or breaking the current

13

Magnetic material

A material that is attracted to a magnet, such as iron, cobalt, nickel

14

What is better about an electromagnet than a permanent magnet?

You can turn electromagnets on and off

You can make electromagnets that are much stronger than permanent magnets

15

In a parallel circuit with one ammeter on each path, is the total current shown on these ammeters? If not, how do you find the total current?

They don’t, you can find the total current by adding the values on the different ammeters, and you get the total current

16

neutron

A neutral particle found in atoms

17

Can electrons pass through insulators?

No

18

battery

Two or more electrical cells joined together

19

Is wood a good conductor or insulator?

Good insulator

20

Series

A circuit in which all components are joined in a single loop

21

Parallel

A circuit in which there are two or more paths or branches for the current

22

Do conductors have high or low resistance?

Low resistance

23

Resistance

How difficult it is for current to flow through a component in a circuit

24

ammeter

A device for measuring electric current in a circuit

25

negative

The charge on an electron, or on an object that has had electrons transferred to it

26

North pole

The pole of a magnet that points towards the north

27

electron

A negatively charged particle found in an atom

28

South pole

The pole of a magnet that points towards the south

29

positive

The charge on a proton, or on an object that has had electrons transferred from it

30

electric field

A region where a charged material or particle experiences a force

31

Electromagnet

A temporary magnet produced using an electric current

32

rating

The value of potential difference at which a cell or bulb operation

33

repel

Be pushed away from each other, eg 2 positive charges

34

potential distance

A measure of the push of a cell or a battery , or the energy that the cell or battery can supply

35

Insulator

A material that does not conduct electricity or transfer energy well

36

Is a metal a good conductor or insulator?

Good conductor

37

Magnetise

Make into a magnet

38

Is the potential difference across each component in a parallel circuit the same as the potential difference across the cell? If not, how do you find the potential difference across the cell?

Yes

39

Core

A rod of a magnetic material placed inside a coil to make the magnetic field of an electromagnet stronger

40

Is the potential difference across each component in a series circuit the same as the potential difference across the cell? If not, how do you find the potential difference across the cell?

No, to find potential difference across the cell add up the potential difference across each cell

41

Magnetic field lines

Imaginary lines that show the direction of the force on magnetic material

42

voltage

A measure of the strength of a cell or a battery used to send a current around a circuit

43

Electric charge

A property of a material or particle that can be negative or positive

44

cell

A chemical store of energy, which provides the push that moves charge around a circuit

45

attract

Be pulled together, eg north and south poles on magnets, negative and positive charges

46

How can you make an electromagnet stronger?

The number of turns of wire on the core. More turns of wire will make a stronger electromagnet

Increase the current flowing through the wire

The type of core. Using a magnetic material in the core will make a stronger electromagnet

47

voltmeter

A device for measuring voltage

48

Conductor

A material that conducts charge or energy well