Brainscape's Knowledge GenomeTM

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


See full index

Physics Paper 1 > Phy2 - Electricity > Flashcards

Phy2 - Electricity Flashcards

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

What is current?

A

The rate of flow of charge

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

What is the equation for charge flow?

A

Charge flow = current × time
Q = I × t

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

What is the equation for potential difference?

A

Potential Difference = current × resistance
V = I × R

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

For a given potential difference
what happens to the current when the resistance increases?

A

The current decreases

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

What happens to the resistance of a thermistor as temperature increases?

A

The resistance decreases

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

What happenes to the resistance of a LDR as light increases?

A

Resistance decreases

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

What is the diifference between direct current and alternating current?

A

• Direct current flows in only one direction
• Alternating current constantly changes direction

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

What is the rule for current in a series circuit?

A

Current stays the same througout the whole circuit

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

Name the electrical component in thermostats

A

Thermistor

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

Where are LDRs commonly found?

A

LDRs are used as automatic night
lights / burglar detectors (in bright light the resistance is low)

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

What is the National Grid?

A

A system of cables and transformers

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

What is the rule for potential difference in series circuits?

A

Potential difference is shared between components

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

Where should you place an ammeter to measure the current through a component?

A

The ammeter should be placed in series with the component

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

What is the rule for potential difference in a parallel circuit?

A

It stays the same in each branch

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

Where should you place a voltmeter to measure the potential difference through a component

A

The voltmeter should be placed parallel to the component

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

What type of electricity supply is a battery?

A

Direct current (DC)

17
Q

What is the total resistance of these resistors in series?
—[]——[]——[]—
10Ω 10Ω 5Ω

A

25Ω

18
Q

What is the rule for current in a parallel circuit?

A

Current is shared between the branches

19
Q

What type of electricity supply is mains electricity?

A

Alternating current (AC)

20
Q

Name the piece of equipment used to measure potential difference

A

Voltmeter

21
Q

What is the frequency of mains electricity?

A

50 Hz

22
Q

Name the 3 wires in a 3-core cable and say what colour they are

A

• Live wire (brown)
• Neutral wire (blue)
• Earth wire (green /yellow
striped)

23
Q

What is the function of the neutral wire (blue)?

A

Completes the circuit carrying current away (0V)

24
Q

What is the function of the live wire (brown)?

A

Provides the alternating potential difference (230V)

25
Q

What is the function of the earth wire (yellow/green)?

A

Acts as a safety device, stopping the appliance casing from becoming live (0V)

26
Q

What is the equation of power, current and potential difference?

A

Power = Current × PD
Power = I × V

27
Q

What two things determine the energy transferred from an electrical appliance?

A

• How long the appliance is on for
• The power rating of the appliance

28
Q

What is the equation for energy transferred?

A

Energy transferred = Charge flow × potential difference
E = Q × V

29
Q

What is the equation for power, current and resistance?

A

Power = current² × resistance
P = I² × Ω

30
Q

What is the potential difference of Mains Electricity?

A

230V

31
Q

In a parallel circuit, what happens to the total resistance when you add a resistor?

A

The total resistance decreases

32
Q

What is the equation for energy transferred, power and time?

A

Energy transferred = Power × time
E = P × t

33
Q

What piece of equipment is used to measure current?

A

Ammeter

Physics Paper 1 (2 decks)

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