Brainscape's Knowledge GenomeTM

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


See full index

Physics mock > Electricity > Flashcards

Electricity Flashcards

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

what do fuses do

A

fuses stop the flow of current

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

how do fuses stop the flow of current

A

by melting the current to high

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

what do circuit breakers do

A

circuit breakers break the circuit if the current is to high

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

what does insulation and double insulation do

A

prevents people from touching exposed wires and getting shocked

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

what does earthing do

A

earthing provides a low resistance path to the ground. Earthing is mainly used to prevent an electric shock

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

why a current in a resistor results in the electrical

transfer of energy and an increase in temperature, and how?

A

resistors slow down the movement of electrons in the current, so the KE that was moving them is transferred into heat energy.

This can be used for various domestics contexts: e.g hair dryer, heaters

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

what is the equation for power

A

power = current x voltage

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

what is the equation of energy transferred?

A

energy transferred = current x voltage x time

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

what is an AC?

A

AC stands for alternative current. It is a typical electrical current, in which the direction of the flow of electrons switches back and forth.
It is used to deliver power to houses, office buildings, etc.

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

what is DC?

A

DC stands for direct current. It is an electrical current that flows in one direction. It is produced from a battery and used in some sensitive components

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

give 2 advantages on using a paralleled circuit

A
  • -> allows additional components

- -> if one breaks, current can still flow through the other parts of the circuit

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

give 2 advantages of a series circuit

A

→ fewer wires, cheaper and easier to assemble.

→ uses less power.

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

why does the current in a series circuit depend on the applied voltage, number and nature of other components?

A
  • as the voltage increases, the current also increases.

- in general, the more components in a circuit, the lower the current.

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

how does a current vary with wire?

A

with wire the current is directly proportional to the voltage (because the temperature is constant)

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

how does a current vary with resistors?

A

the current flowing will be the exact same as it was before the resistor. The current will become smaller though (the resistor reduces the current)

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

how does a current vary with metal filament lamps?

A

since the temperature ins’t constant in a filament lamp, the resistance increases dramatically as the current increases (because the lamp gets too hot in order to give out light)

17
Q

how does a current vary with diode?

A

it will only allow the current to flow in one direction, as it has high resistance the other way.

(remember to look at picture on google docs.)

18
Q

what is the effect of increasing resistance of a current in a circuit?

A

by increasing the resistance it decreases the current.

19
Q

how do you increase the resistance of a current in a circuit?

A

by adding more components with higher resistance.

20
Q

what is the effect of decreasing resistance of a current in a circuit?

A

by decreasing the resistance it will increase the current.

21
Q

how do you decrease the resistance of a current in a circuit?

A

by replacing components of higher resistance with lower resistance ones.

22
Q

what is the resistance of LDRs with illumination?

A

as illumination increases, resistance decreases

23
Q

what does LDR stand for?

A

light-dependent resistors

24
Q

what is the resistance for thermistors with temperature?

A

as temperature increases, resistance decreases

25
Q

how do you check if there is a current in a circuit?

A

by adding a lamp or LEDs. If the current is flowing, the lamp will start glowing (hahhahah that rhymed… i think i have been studying too much… by the way the word is supposed to be “light up” but i thought “glowing” would sound cooler)

26
Q

what is the formula for the relationship between voltage, current and
resistance

A

voltage = current × resistance

V = I × R

27
Q

what is the rate flow of charge?

A

current

28
Q

what is the formula for the relationship between charge, current and
time?

A

charge = current × time

Q = I × t

29
Q

what is the electric current in solid metallic conductors?

A

a flow of negatively charged electrons. The electrons are free to flow in a metal to carry change.

30
Q

what does a junction current look like?

A

A junction current splits to take both paths, they soon come back together when the paths meet again.

31
Q

what is the voltage like when it is across two components connected in a parallel?

A

the voltage is the same

32
Q

what is voltage?

A

it is the pressure from an electrical circuit’s power source that pushes charged electrons (the current) through a conducting loop. This enables them to do things such as light up a light bulb.

33
Q

how is voltage measured like?

A

in volts

34
Q

what is the formula for the relationship between energy transferred,
charge and voltage

A

energy transferred = charge × voltage

E = Q × V

35
Q

what happens in a current when the voltage increases?

A

the current also increases

36
Q

the more components in a circuit…

A

the lower the current.

Physics mock (4 decks)

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