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
