Brainscape's Knowledge GenomeTM

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


See full index

Physics Electricity > P5 Revision > Flashcards

P5 Revision Flashcards

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

What is a cell?

A

A cell pushes electrons around a complete circuit

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

what is a switch

A

Allows current to be switched on or off

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

What is an indicator

A

An indicator emits light as a signal when current passes through

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

What is a diode?

A

A diode allows current to pass through in 1 direction only

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

What does a light emitting diode do?

A

Emits light when current passes through in a forward direction

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

What does an ammeter do

A

Measures electric current

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

What does a fixed resistor do?

A

Limits current in a circuit

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

What is a variable resistor?

A

allows current to be varied

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

what is a fuse

A

melts or breaks the circuit when current exceeds a certain amount

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

what is a heater

A

Heaters are designed to transfer energy from electric current to heat the surroundings

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

what is a voltmeter

A

Measures potential difference

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

charge flow =

A

current x time taken

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

potential difference across a component =

A

energy transferred/ charge

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

resistance =

A

P.d/ current

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

Unit for P.d

A

Volts

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

Unit for energy

A

Joules

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

Unit for charge

A

Coulombs

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

Unit for current

A

Amps

19
Q

Unit for power

A

Watts

20
Q

Ohms law?

A

The current through a resistor at constant temperature is directly proportional to potential difference across the resistor.

21
Q

what is a thermistor

A

A thermistor is a temperature dependent resistor

22
Q

What happens to resistance when temperature increases in a thermistor

A

Decreases

23
Q

What happens to resistance when light intensity increases in an LDR

A

Decreases

24
Q

Forward resistance in Diode?

A

Low

25
Q

Reverse resistance in diode?

A

High

26
Q

Total resistance :

A

R1 + R2

27
Q

What is direct current

A

Direct current is current which flows in 1 direction only

28
Q

What is alternating current?

A

Alternating current is current which repeatedly reverse flow of direction of charge

29
Q

What is a live wire

A

The live wire is connected directly to the generators of the electricity supply company .It carries current at high voltages (about 220−230V)

30
Q

What is a neutral wire

A

Neutral wires take current back from the consumer to the National Power Grid

31
Q

What are step up transformers?

A

Used by power stations to transfer electricity to the National Grid

32
Q

what are step down transformers?

A

Step down transformers deliver electricity to consumers such as homes and offices. Supplied at 230V

33
Q

Parts of a three pin plug

A

Earth Wire, Neutral wire, live wire and fuse box

34
Q

Colour of earth wire

A

Green and Yellow

35
Q

Colour of Neutral Wire

A

Blue

36
Q

Colour of Live Wire

A

Brown

37
Q

Why are pins made of brass and not copper

A

Brass because Brass is a good conductor and doesn’t rust or oxidise

38
Q

Why are copper used for the wires?

A

Because it is a good conductor and bends easily

39
Q

Energy Transferred =

A

Power/ Time

40
Q

Power supplied

A

current x potential difference

41
Q

Power supplied to a resistor :

A

Current2 x Resistance

42
Q

When charge flows through a resistor…

A

energy is transferred to the resistor, and the resistor becomes hotter

43
Q

efficiency

A

its output power/ input power (x100)

44
Q

output power =

A

efficiency x input power

Physics Electricity (1 decks)

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