Brainscape's Knowledge GenomeTM

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


See full index

Combined Physics Master > Electricity > Flashcards

Electricity Flashcards

To revise the key points from the Electricity topic (paper 1)

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

Draw the circuit symbol for a lamp

A

an X in a circle

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

Draw the circuit symbol for a diode

A

An arrow head in a circle

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

Draw the circuit symbol for a resistor

A

A rectangular box

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

Draw the circuit symbol for a variable resistor

A

A rectangular box with a diagonal arrow

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

Draw the circuit symbol for an LED

A

Same as a diode with 2 arrows points away

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

Draw the circuit symbol for a fuse

A

A rectangular box with a horizontal one running through it

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

Draw the circuit symbol for a voltmeter

A

V in a circle

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

Draw the circuit symbol for an ammeter

A

A in a circle

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

Draw the circuit symbol for a thermistor

A

a rectangular box with a diagonal line through it

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

Draw the circuit symbol for an LDR

A

A rectangular box in a circular with 2 arrows pointing towards it

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

Define Current

A

Flow of charge (electrons) measured in amps (A)

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

State the equation that links charge, current and time.

A 
Charge = Current x time 
Q = It
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the units of charge

A

Coulombs (C)

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

What is the relationship between current and resistance?

A

As resistance increases, current decreases and vice versa

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

State the equation that links potential difference, current and resistance

A

Potential difference = Current x resistance

V = IR

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

State the units of potential difference

A

Volts (V)

17
Q

State the units of resistance

A

Ohms

18
Q

State the relationship between the length of wire and its resistance.

A

As the length of the wire increases the resistance increases. they are directly proportional

19
Q

As more resistors are added in series what happens to the total resistance.

A

Total resistance increases (Rt = R1 + R2 + …..)

20
Q

State ohms law

A

Current is directly proportional to potential difference constant temperature. this means resistance remains constant.

21
Q

Sketch the I/V graph for a resistor

A

A straight line through the origin (current and potential difference are directly proportional - an ohmic conductor)

22
Q

Sketch the I/V graph for a bulb

A

It starts off as a straight line through the origin but the the current levels offs so the graph curves. Non ohmic conductor

23
Q

How does the resistance of a lamp change as it heats up?

A

As temperature increases resistance increase. Atoms/ions have more energy so vibrate more taking up more space making it harder for electrons to travel down the wire.

24
Q

Sketch the I/V graph for a diode

A

Current can only flow in one directions. So zero current in the negative direction but in the positive direction current increases slightly after the origin. Non ohmic conductor

25
Q

State the relationship between temperature and resistance for a thermistor

A

As temperature increases resistance decreases.

26
Q

State some uses of thermistors

A

In thermostats to turn circuits on/off if they get too hot to cold e.g. in an iron, hair straighteners etc

27
Q

State the relationship between resistance and light intensity for a LDR

A

As light intensity increases, resistance decreases

28
Q

State some uses of LDRs

A

In circuits to switch lights on when it gets dark

29
Q

state the rules for current, potential difference and resistance in a series circuit

A

Current - same flowing through each component
Potential difference - the p.d. of the power supply is shared between the other components
Resistance - the total resistance increases as more components are added. the total resistance is the sum of all the individual components resistance

30
Q

state the rules for current, potential difference and resistance in a parallel circuit

A

current - splits up but the total current stays the same
Potential difference - across each brach is the same as from the battery
Resistance - decreases as more branches are added. the electrons have more choice of paths to take.

Combined Physics Master (10 decks)

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