Electrical Quantities Flashcards

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

How do Charges Interact?

A

Like Charges Repel one another while Opposite Charges attract.

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

What is an electric field?

A

Similar to magnetic fields an electric field is a region in which an electric charge experiences a force.

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

What is Electric Current?

A

Current is the amount of charge passing through a point per a unit of time

I = Q / t

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

What is electric Charger?

A

Charge is measured in coulombs.

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

Convectional Current vs. Flow of Electrons

A

Positive → Negative vs. Negative → Positive

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

How can electrical current be measured?

A

An ammeter can be used to measure the magnitude and direction of the current.

  1. ensure the range is correct!
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is Electromotive force? (e.m.f)

A

It is the electrical work done by a source in moving a unit charge around a complete circuit.

E(V) = Wd / Q

Work done per unit charge is also called potential difference!

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

How are Volts measured?

A

By using a voltmeter, connect positive to positive; negative yo negative, connected in parallel

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

What is Resistance?

A

Resistance is how difficult current travels through a conductor.

V = IR

or

R = V / I (ohms)

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

How is resistance measured?

A

Resistance can be measured by:

  1. setting up a circuit diagram with ammeters, voltmeters and a resisor.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How do cross-sections of a wire affect resistance? Also, how does length affect resistance?

A

A larger cross section has less resistance, whilst a smaller one has more. Resistanceis inversely proportional to the crossection

Longer wires have larger resistance, shorter ones have less. Resistance is directly proportional to length.

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

How does Power relate to electricity?

A

P = I x V

E = Pt

T = I x V x T

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