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ECE 2205 > Week 1 > Flashcards

Week 1 Flashcards

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1
Q

What is the most important quantity in electric circuits?

A

Charge

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2
Q

Define charge

A

A fundamental quantity of matter. Difficult to define itself, but easy to define if something has it or not

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3
Q

What are the symbols for charge

A

Q: for a constant
q: for a function

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4
Q

A stable atom has a net charge of _____

A

Zero

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5
Q

Define electric current

A

The flow of charge

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6
Q

What are the symbols for current

A

I or i

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7
Q

True or False: Current, in layman’s terms, is simply charge per second

A

True

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8
Q

Are electric circuits electrically neutral?

A

Yes, the current just moves but the charge of the entire system does not change

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9
Q

We only consider current caused by a flow of __________

A

Electrons

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10
Q

Does current and electron flow go in the same direction?

A

No, they go in opposite directions

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11
Q

True or False: Current is a scalar

A

False

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12
Q

True or False: Electric current is like jamming electrons in one end and immediately pulling electrons out the other end, this creates an almost instantaneous current

A

True

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13
Q

Define voltage

A

The potential energy of a circuit. It is the work done per unit of charge

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14
Q

What are the symbols for voltage?

A

V or v

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15
Q

True or False: Voltage can be measured from one point on the circuit

A

False, voltage must be measured between two points since work is done by applying a force across a distance

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16
Q

True or False: Voltage is a vector

A

False

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17
Q

Define power

A

The work done to charge per unit time

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18
Q

What is the scuffed engineering formula for power and what is the actual formula for power?

A

Scuffed: P=VI

Math-y: p(t)=dw(t)/dt

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19
Q

If power is negative, that means power ____ and is _______ the circuit

A

Supplies, putting power into

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20
Q

If power is positive, that means power is _________ the circuit

A

Dissipating from

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21
Q

Define resistance

A

The voltage difference required to drive a specific current through that object

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22
Q

What is the symbol for resistance?

A

R

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23
Q

Define capacitance

A

The charge stored per change in voltage

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24
Q

What is the symbol for capacitance?

A

C

25
Q

Define inductance

A

The voltage per change in current

26
Q

What is the symbol for inductance?

A

L

27
Q

What is the SI unit for charge?

A

Coulomb, C

28
Q

What is the SI unit for current?

A

Ampere, A

29
Q

What is the SI unit for voltage?

A

Volt, V

30
Q

What is the SI unit for power?

A

Watt, W

31
Q

What is the SI unit for capacitance?

A

Farad, F

32
Q

What is the SI unit for inductance?

A

Henry, H

33
Q

Define circuit element

A

Any device wired into the circuit

34
Q

Define terminal

A

The part of a circuit element that makes electrical contact with the rest of the circuit

35
Q

Define node

A

An electrical connection between two or more circuit elements

36
Q

Define circuit diagram

A

A representative schematic of the physical circuit

37
Q

Define ideal wire

A

A path in a circuit through which an unlimited amount of current can flow with zero voltage difference

38
Q

Define ideal voltage source

A

A two-terminal circuit element that produces a constant voltage difference between those terminals, regardless of the current that flows through it

39
Q

Define ideal current source

A

A two-terminal circuit element that produces a constant current flowing through the terminals, regardless of the voltage difference that is across its terminals

40
Q

True or False: Voltage sources are more familiar to most people than current sources. Examples include batteries and power outlets

A

True

41
Q

If two points on a circuit are not connected by any path of wires or other circuit elements, then an __________ exists between those two points

A

Open circuit

42
Q

If two points on a circuit are connected by at least one path that only consists of wires, then a ___________ exists between those two points

A

Short circuit

43
Q

Define open circuit voltage

A

The voltage difference between two terminals when the current is zero. For a voltage source, this is the maximum voltage that can be produced

44
Q

Define short circuit current

A

The current flowing through the terminals when the voltage difference is zero. For a current source, this is the maximum current that can be produced

45
Q

True or False: An independent voltage source has a constant open circuit voltage

A

True

46
Q

True or False: An independent current source does not maintain its short circuit current

A

False

47
Q

Define dependent voltage source

A

A circuit element that has an open circuit voltage that is controlled by the voltage across, or current through, some other element in the circuit

48
Q

True or False: A wire intersection is represented by a solid dot on a circuit diagram

A

True

49
Q

True or False: A wire passing over another wire is represented by the removal of a solid dot or a small curve over the passing wire

A

True

50
Q

Define v-i diagram

A

Measures the performance of a circuit element

51
Q

Define Kirchhoff’s Current Law

A

The sum of all currents entering a node is equal to the sum of all currents leaving the node

52
Q

Define Kirchhoff’s Voltage Law

A

The sum of all voltages around a loop is zero

53
Q

Define Tellegen’s Theorem

A

The sum of the power dissipated in every circuit element is zero if the circuit obeys KCL and KVL

54
Q

Define ground

A

A fictitious circuit element with only one terminal that is at a voltage of zero, and can collect or produce an infinite amount of current

55
Q

Define supply

A

A fictitious circuit element with only one terminal that represents one terminal of a voltage source. It can collect or produce an infinite amount of current. It can only be used when a ground is also used to represent the other terminal of the voltage source. Should be labelled with the voltage V

56
Q

Define the amended Kirchhoff’s Current Law (for supplies and grounds)

A

KCL still holds for any junction of three or more wires, but in addition an arbitrary amount of current can enter or leave a ground or supply

57
Q

Define the amended Kirchhoff’s Voltage Law (for supplies and grounds)

A

KVL still holds for any closed loop in the circuit, but in addition, the voltage drops for all elements that connect a supply to a ground must equal the voltage of the supply (This is the “balance equation” form of KVL)

58
Q

What does the v-i graph of an ideal voltage source look like?

A

A positive, horizontal line that does not diminish with more current

59
Q

What does the v-i graph of an ideal current source look like?

A

A positive, vertical line that does not diminish with more voltage

ECE 2205 (2 decks)

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