Brainscape's Knowledge GenomeTM

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


See full index

Physics > Module 4 > Flashcards

Module 4 Flashcards

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

Electric Current

A

Rate of flow of charged particles

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

Conventional Current

A

A model used to describe the net movement of charge in a circuit. Conventional current flows from the positive to the negative terminal.

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

Conservation of Charge

A

Charge is conserved in all interactions: it cannot be created or destroyed.

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

Coulomb

A

One coulomb of electric charge passes a point in one second when there is an electric current of one ampere flowing.

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

Amp

A

The current flowing in two parallel wires separated by one metre in a vacuum such that there is an attractive force of 2.0 x 10^-7 N per metre length of wire between them.

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

Electrolyte

A

A fluid that contains ions that are free to move, act as charge carriers and hence conduct electricity.

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

Number Density

A

The number of free (delocalised) electrons per unit volume of material.

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

Conductor

A

A material with a high number density of conduction electrons and therefore a low resistance.

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

Insulator

A

Amaterial with a small number density of conduction electrons and therefore a very high resistance.

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

Semiconductor

A

A material with a lower number density of conduction electrons than a conductor and therefore a higher resistance.

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

Mean Drift Velocity

A

The average displacement of electrons moving along a wire per unit time.

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

Electromotive force

A

EMF is the energy transferred per unit charge when chemical energy is converted into electrical energy.

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

Potential Difference

A

Potential difference is the energy transferred per unit charge when electrical energy is converted into another form of energy.

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

Volt

A

Where one joule of energy is transferred when one coulomb of charge passes from one point to the other.

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

Resistance

A

The resistance of a conductor is the ratio of the pd across it to the current flowing through it.

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

Ohm

A

P.D. Of 1V
Currents of 1A

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

Ohm’s Law

A

For a conductor at constant temperature, the current flowing through the conductor is directly proportional to the pd across its ends.

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

Kilowatt-hour

A

For a conductor at constant temperature, the current flowing through the conductor is directly proportional to the pd across its ends.

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

Kirchoff’s First Law

A

The sum of the currents entering any point in an electrical circuit is equal to the sum of the currents leaving that point, as charge is conserved.

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

Kirchoff’s Second Law

A

The sum of the emfs around any closed loop in a circuit is equal to the sum of the pds around the same closed loop, as energy is conserved.

21
Q

Internal Resistance

A

Some energy is transformed into thermal energy within the cell; it behaves as if it had a resistance.

22
Q

Resistivity

A

The material’s resistance multiplied by its cross-sectional area divided by its length.

23
Q

Progressive Wave

A

A wave which transfers energy from one point to another without a transfer of matter.

24
Q

Longitudinal Wave

A

A wave where the oscillations of the particles are parallel to the direction of travel of the wave.

25
Q

Transverse Wave

A

A wave where the oscillations of the particles are perpendicular to the direction of travel of the wave.

26
Q

Displacement (wave)

A

The distance of a point on the wave from the equilibrium position.

27
Q

Amplitude

A

The maximum displacement of any point on the wave from the equilibrium position.

28
Q

Wavelength

A

The distance from any point on the wave to the next subsequent point in phase.

29
Q

Wave Speed

A

The speed at which energy is transferred by the wave.

30
Q

Frequency (wave)

A

The number of oscillations at a point per unit time.

31
Q

Time Period

A

The time taken for one complete oscillation.

32
Q

Phase Difference

A

How far ‘out of step’ the oscillations at two points on the same wave are.

33
Q

Diffraction

A

The spreading out of a wave after passing through a gap or past an obstacle.

34
Q

Plane Polarisation

A

Plane polarised waves have oscillations in one plane only, which is perpendicular to the direction of propagation.

35
Q

Intensity

A

The rate of energy incident per unit area.

36
Q

Refreactive Index

A

Amaterial property equal to the ratio between the speed of light in a vacuum and the speed of light in that given medium.

37
Q

Critical Angle

A

The angle of incidence that results in the refracted ray travelling along the media boundary. (angle of refraction = 90°)

38
Q

Interference

A

When two or more coherent waves superpose at a point, there is a change in overall displacement.

39
Q

Principle of Superposition

A

When two waves interfere at a point, the resultant displacement is the sum of the individual displacements.

40
Q

Path Difference

A

The extra distance travelled by one of the waves compared with the other.

41
Q

Coherent Waves

A

Waves which have a constant phase difference.

42
Q

Node

A

A point where the amplitude of oscillations is always zero.

43
Q

Antinode

A

A point where the amplitude of oscillations takes the maximum possible value.

44
Q

The Photoelectric Effect

A

The emission of electrons from a metal surface when photons are incident on that surface.

45
Q

Photon

A

A quantum of energy of electromagnetic radiation.

46
Q

Electronvolt

A

The energy gained by an electron which is accelerated through a pd of one volt.

47
Q

Threshold Frequency

A

The minimum frequency of electromagnetic radiation required to eject an electron from a metal surface during the photoelectric effect.

48
Q

Work Function

A

The minimum energy of electromagnetic radiation required to eject an electron from a metal surface during the photoelectric effect.

49
Q

De Broglie Wavelength

A

The wavelength associated with a particle with mass. It depends on the particle’s momentum.

Physics (9 decks)

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