Chapter 1. Basic Concepts Flashcards

1
Q

What does charge measure?

A

counts the number of electrons (or positive charges) present

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

SI unit for charge

A

Coulomb, Q/q

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

What’s the difference between a capital variable and a lower case variable?

A

Capital = constant quantity
lowercase = variant quantity

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

One Coloumb is equal to

A

6.24 x 10^18

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

The movement of charges is called an

A

electric current

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

conventional direction of current flow is opposite to

A

direction of electron (negative charge) flow

Flows from positive terminal of battery

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

Electron flow flows towards

A

positive terminal of battery

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

Electric current (i) is described as… and is measured in…

A

change in charge over change in time, and measured in amperes

i = dq/dt

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

The charge transferred between t₀ and t will be…

A

Q(t) = ∫idt + Qt₀
integral has upper limit t
and lower limit t₀

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

What is voltage?

A

potential difference between two points

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

for Vab, what does a and b represent?

A

a = higher potential energy
b = lower potential energy

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

Power is described as…

A

the rate of energy provided per time

p = dw/dt

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

How do we calculate power?

A

p = vi = v²/R = i²R

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

When is power absorbed?
p = +vi

A

When current enters through the positive terminal and leaves through the negative terminal. (came with high energy and left with low energy)

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

When is power supplied?
p = -vi

A

When current enters through the negative terminal and leaves through the positive terminal. (came with low energy and left with high energy)

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

How does the law of conservation of energy apply to passive sign convention?

A

The sum of all power supplied must be absorbed by other elements

17
Q

How are energy and power related?

A

w = ∫ p dt = ∫ vi dt

upper limit = t
lower limit = t₀

18
Q

What are examples of active elements?
(generate energy)

A

Generators
Batteries
Operational Amplifiers

19
Q

What are examples of passive elements?
(absorb energy)

A

Resistors
Capacitors
Inductors

20
Q

How do we distinguish between dependent and independent sources?

A

independent = circle
dependent = diamond

21
Q

What’s an ideal voltage source?

A

provides a specified voltage that is independent of other elements.

It has no internal resistance

22
Q

What is internal resistance?

A

the opposition to the flow of current offered by the cells and batteries themselves resulting in the generation of heat.

23
Q

What’s an ideal current source?

A

will generate any voltage to establish the desired current through them.

It has infinite internal resistance