Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

physics > electricity > Flashcards

electricity Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

what are the two types of electrical charge

A

positive and negative

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what are neutral charges

A

they have no electrical charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

do like charges repel or attract

A

repel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

do opposite charges repel or attract

A

attract

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is the nucleus of an atom made up of

A

protons (+) and neutrons (=)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what orbits the nucleus of an atom

A

electrons (-)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what are conductors

A

materials that allow current to pass through them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what are insulators

A

materials that do not allow current to pass through them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what is electrical current

A

the electric charge transferred per second/unit time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Q=It

A

charge (C) = current (A) time (s)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what does a cell do

A

provide voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what does a battery do

A

provide voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what does a lamp do

A

produces light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what does a switch do

A

control a circuit (on/off)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what does a resistor do

A

control resistance (fixed)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what does a variable resistor do

A

to control resistance (variable)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what does a voltmeter do

A

measure voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what does a ammeter do

A

measure current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what does a motor do

A

produce rotational movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

current in a series circuit ____

A

is the same at every point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

the current in a parallel circuit’s branches ____

A

add up to the supply current

22
Q

what is voltage a measure of

A

the electrical energy given to each coulomb of charge in a circuit

23
Q

the voltage across all the components in a series circuit _____

A

add up to the supply voltage

24
Q

the voltage across the branches of a parallel circuit ____

A

are the same as the supply voltage

25
Q

in a.c., the flow of electrons does what

A

continually changes direction back and forth

26
Q

in d.c., the flow of electrons does what

A

stays in the same direction

27
Q

example of an a.c. source

A

UK mains power supply (230V)

28
Q

example of a d.c. source

A

batteries and cells

29
Q

how to calculate resistance in a series circuit

A

R(total) = R(1) + R(2) + ….

30
Q

resistors in parallel circuits

A

1/R(T) = 1/R(1) + 1/R(2) + ….

31
Q

V=IR

A

voltage (V) = current (A) resistance (Ω)

32
Q

what can variable resistors be used for

A

dimmer switches and volume controls

33
Q

what does the resistance of an LDR vary with

A

light levels, light up resistance down

34
Q

what does the resistance of a thermistor vary with

A

temperature, temp up resistance down

35
Q

what does a photovoltaic/solar cell do

A

converts light energy to electrical engery

36
Q

what does a diode do

A

it only allows current to flow in one direction

37
Q

what way should the diode be to allow current to flow

A

the anode on the power supply should be connected to the diode and the two cathodes should also be connected

38
Q

what does LED stand for

A

light emitting diode

39
Q

what does a capacitor do

A

it stores electrical charge

40
Q

what does a relay switch do

A

the coil in one circuit becomes magnetised, which close the switch in the second circuit

41
Q

in a potential divider, the higher the resistance the ____ the voltage across it is

A

higher

42
Q

potential divider formulas

A

V2 = ( R1 / R1 + R2 ) Vs , V1/V2 = R1/R2

43
Q

what can transistors be used as

A

electronic switches in circuits

44
Q

what is the switch on voltage for a NPN transistor

A

about 0.7V

45
Q

what does the variable resistor do in a potential divider circuit with a transistor

A

changes when the circuit switches on and off

46
Q

what voltage do MOSFETs switch on at

A

about 2V

47
Q

what is power a measure of (not rate)

A

the energy transferred per second

48
Q

P=E/t

A

power (W) = energy (J) / time (s)

49
Q

what is electrical power (not per second)

A

the rate at which electrical energy is transferred

50
Q

when should a 3A fuse be used

A

if an appliance has a power rating of less than 720W

51
Q

when should a 13A fuse be used

A

if an appliance has a power rating greater than 720W

physics (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions