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

literally fucking aids of a topic

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

Electric Charge

A

(Q or q), Indicates if a body has an excess or deficiency of electrons

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

Conductor

A

Any substance through which electric charge can flow.

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

Insulator

A

Any substance through which electric charge cannot flow

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

Point Discharge

A

The phenomenon where ions in the air are either strongly attracted or repelled from the tip of a charged conductor and move towards or away from it.

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

Coulomb’s Law

A

The electrostatic force between two point charges is proportional to the product of their charges and inveersely proportional to the square of the distance between them.

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

Electric Fields

A

The region of space in which electric charges at rest experience an electrostatic force.

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

Electric Field Lines

A

The line along which a positive charge would move if placed in the electric field.

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

Electric Field Strength

A

(E), the force per unit positive charge at a point

(N C^-1 or V m^-1)

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

Potential Difference

A

The work done in moving a charge of one Coulomb from one point to the other.

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

Electromotive Force

A

(emf) is the voltage that is applied to a cicuit.

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

Capacitance

A

The ratio of the charge on the capacitor to the poitential difference applied across it.

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

Capacitor

A

An electrical device capable of storing electric charge.

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

Electric Current

A

(I), The flow of electric charge.

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

Joule’s Law

A

The rate of heat production in a conductor is proportional to the square of the current; provided its resistance is a constant.

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

Fuse

A

A piece of wire that will melt when a current above a certain size passes through it.

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

Miniature Circuit Breakers

A

(MCBs), are safety devices used to prevent electrocution by fire by preventing too large a current flowing in the circuit.

They contain a bimetallic strip and an electromagnet.

They are advantageous over fuses becuase they operate faster and can be reset with a switch.

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

Residual Current Devices.

A

(RCDs), are trip switches that cut off current very quickly when a fault in an appliance causes a small current to flow to earth.

They serve the same purpose as an MCB but operate much faster and can be used when dealing with very small currents- therefore safer.

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

Resistance

A

(R), is the ratio of voltage across an object to the current through it.

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

Resistor

A

A device that converts electrical potential energy to some other form.

20
Q

Ohm’s Law

A

Under constant physical conditions, the potential difference across a conductor is proportional to the current flowing through it.

21
Q

Resistivity

A

(p), is the constant associated with the resistance of a body; it is equal to the product of the resistance of the body an its cross-sectional area divided by length.

22
Q

Wheatstone Bridge

A

A device used to measure the resistance of an unknown resistor.

Advantages: More accurate than an ohmeter, multimeter or combination of an ammeter and voltmeter.

Disadvantages: Less compact or portable and takes more time to set up than an ohmeter, multimeter or combination of ammeter and voltmeter.

23
Q

Semiconductor

A

A substance whose resistivity is between that of a good conductor and a good insulator.

24
Q

Intrinsic Conduction

A

The movement of charge through a pure semiconductor

25
Q

Extrinsic Conduction

A

The movement of charge through a doped semiconductor.

26
Q

Doping

A

The addition of a small amount of another element to a pure semiconductor to increase its conductivity.

27
Q

N-type Semiconductor

A

One in which the impurity added produces more free electrons available for conduction.

28
Q

P-type Semiconductor

A

One in which the impurity added produces extra holes which are available for conduction.

29
Q

Diode

A

A semiconductor device which allows current to flow in one direction only.

30
Q

LDR

A

(Light-dependent resistor), is a semiconductor whose resistance varies from a high value in the dark to a lower value in bright light.

31
Q

Thermistor

A

A semiconductor device whose resistance decreases rapidly with increasing temperature.

32
Q

Magnetism

A

The phenomenon by which certain materials eert attractive or repulsive forces on other materials.

33
Q

Magnetiv Fields

A

The region in space where magnetic forces can be felt.

34
Q

Magnetic Field Lines

A

Indicates the direction a “magnetic north” would travel in a magnetic field is free to do so.

35
Q

Magnetic Flux Density

A

(B), is the measure of the strength of the magnetic field.

36
Q

Ampere

A

The constant current which, if maintained in two straugh parallel conductors of infinite length, of negligible cross section and placed one metre apart in a vacuum, would produce a force on each conductor of 2x10^-7 newtons per metre of length.

37
Q

Electromagnetic Induction.

A

Where an emf is induces by a change in the magnetic flux linking a circuit.

38
Q

Magnetic Flux

A

(Φ), is the total amount of magnetic field in a given region; it’s the product of magnetic flux density (B))= and area (A).

39
Q

Faraday’s Law

A

The magnitude of the induced emf is proportional to the rate of change of flux linking a curcuit.

40
Q

Lenz’s Law

A

The direction of the induced emg is always such as to oppose the change casuing it.

41
Q

Alternating Current

A

(a.c), is an electric current whose direction reverses periodically due to an alternaating voltage,

42
Q

Direct Current

A

(d.c.), is an electric current that flows continuously in the same direction.

43
Q

Mutual Induction

A

Where a changing magnetic field in one coil induces an emf in another coil.

44
Q

Transformer

A

An electrical device used to change the voltage of a.c. power supplies.

45
Q

Self Induction

A

Where a changing magnetic field in a coil induces an emf in the coil itself.

46
Q

Inductor

A

An electrical device used to induce a back emf.

Physics (4 decks)

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