Brainscape's Knowledge GenomeTM

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


See full index

Physics > Electricity (circuits) > Flashcards

Electricity (circuits) Flashcards

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

How to work out resistance

A

R = V/I

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

Define current

A

The rate of flow of charge where charge is the flow of electrons

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

whats current measured in

A

amps

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

How to work out charge

A

Q (Charge(Coulombs)) = I x T (time(seconds))

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

how do you convert milliamps into amps?

A

(Your mA) x 10^-3

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

in parallel what rules does current follow

A

IT = I1 + I2 + I3

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

the resistance of a filament bulb ________ with potential difference.

A

increases

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

How to work out voltage

A

V = E/Q

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

define Potential difference

A

the electrical energy carried per unit charge

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

in parallel what rules does P.D follow

A

VT = V1 = V2 = V3

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

You have a coil of wire connected to a battery at both ends and an ammeter across the circuit and a voltmeter across the coil of wire. the coil is dipped in water, why?

A

to keep the temperature constant.

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

How do you calculate the total resistance of two resistors in series?

A

add the resistance of both of the resistors together.

RT = R1 + R2 + R3

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

name 4 factors that may effect the resistance of a wire

A

the metal used, the current flowing through it, the length of a wire, and the cross-sectional area.

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

What is charge measured in

A

coulombs

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

in series what rules does P.D follow

A

VT = V1 + V2+V3

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

in parallel what rules does resistance follow

A

RT = R1 + R2 + R3

18
Q

why does the resistance of a filament bulb increase with potential difference.

A

it’s non-ohmic. current increases - flow of electrons increases - more collisions of electrons with atoms increase. atoms vibrate (increase K.E) increase temp.

19
Q

in series what rules does resistance follow

A

RT = 1/R1 + 1/R2 + 1/R3

20
Q

how to work out power

A

P =V x I

21
Q

How do you calculate the total resistance of two resistors in parallel?

A

RT = 1/R1 + 1/R2 + 1/R3

22
Q

what is ohms law

A

The potential difference across a conductor is directly proportional to the current through it.

23
Q

Total resistance in a parallel circuit will always be ______ than the lowest resistor

A

less

24
Q

in series what rules does current follow

A

IT = I1 = I2 = I3

24
Q

describe the effect a variable resistor and a diode has on the current?

A

a diode can only change between a very high resistance (going backwards) and a very low resistance (going forwards). the variable resistor can make more subtle changes.

25
Q

What is the equation for calculating efficiency

A

Efficiency = Useful energy output/total energy input (*100 if you want a percentage)

26
Q

What is AC

A

Alternating Current

27
Q

What is DC

A

Direct current

28
Q

What is the difference between AC and DC

A

For an AC circuit the direction of flow is reversed repeatedly. However in a DC circuit it flows from the positive to the negative terminal without a change in direction.

29
Q

Equation for calculating frequency

A

f = 1/T

30
Q

What is frequency’s units

A

Hz

Herts

31
Q

What colour is the live wire

A

Brown

32
Q

What colour is the earth wire

A

Green and yellow

33
Q

What colour is the neutral wire

A

Blue

34
Q

What makes brass pins good in a plug

A

Hard and rust resistant

35
Q

Why are the plug casings made from plastic

A

For insulation

36
Q

What is the cable grip used for

A

To hold the cable firmly

37
Q

What cable do you have coming out of a plug

A

2 core (only neutral and live) if it is double insulated (When the electrics can never come in contact with the outer casing of the device), 3 core if not.

Physics (7 decks)

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