Electricity Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

In which direction does current flow in a circuit

A

From the positive to negative terminal

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

in what way do electrons travel around a circuit

A

Negative to positive (electrons negatively charged)

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

whats the relationship between current or resistance to temperature

A

If current or resistance increases, then temperature increases

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

How are ammeters added to a circuit

A

In series

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

how are voltmeters added to a circuit

A

they are added in parallel to the circuit

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

How to figure out the potential difference in a series circuit

A

Vtotal=V1 + V2 + v3
the total potential difference is shared across the circuit

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

What is the current in a series circuit?

A

The current is the same anywhere in a series circuit

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

resistance in a series circuit ?

A

Total resistance is just the resistance of each component added together

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

How is a voltmeter connected to a series circuit?

A

A voltmeter is always connected in parallel to a circuit no matter what kind of circuit it is

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

what is a parallel circuit ?

A

a parallel circuit is where the circuit is split into branches

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

How is potential difference shared in a parallel circuit ?

A

The potential difference in each component has the same potential difference equal to the battery
For example
If the circuit is powered by a 12V battery, each component will have the potential difference of 12 volts

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

How is current shared in a parallel circuit ?

A

The total current in a circuit is shared out between each branch
For example
If the total current is 6Amps and there is 2 branches
the current could be shared out in 3A and 3A
or 1A and 5A

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

Describe the resistance in a parallel circuit

A

An increase in components in branches will lead to a decrease in total resistance because more branches leads to an increase in pathways for the current to take
Also
The total resistance is LESS than the resistance of the smallest individual resistor

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

A step up transformer ?

A

A step up transformer INCREASES the voltage but decreases the current because an increase in current increases the temperature and an increase in temperature causes energy to be lost

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

A step down transformer?

A

DECREASES the voltage to not break appliances and it increases the current to 230V to be used in our homes

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

Differences between alternating and direct current

A

ALTERNATING current has the current change direction at a certain frequency in Hz so the current and potential difference changes from positive to negative at 50Hz in the UK and this alternating current is used in the mains

In DIRECT current the direction of the current stays the same and it stays either positive or negative , this current is often used in battery powered devices such as batteries and

you can figure out what current it is using an osciloscope to form a potential difference time graph