Week 1

Question 1

What is the most important quantity in electric circuits?

Answer 1

Charge

Question 2

Define charge

Answer 2

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

Question 3

What are the symbols for charge

Answer 3

Q: for a constant
q: for a function

Question 4

A stable atom has a net charge of _____

Answer 4

Zero

Question 5

Define electric current

Answer 5

The flow of charge

Question 6

What are the symbols for current

Answer 6

I or i

Question 7

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

Answer 7

True

Question 8

Are electric circuits electrically neutral?

Answer 8

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

Question 9

We only consider current caused by a flow of __________

Answer 9

Electrons

Question 10

Does current and electron flow go in the same direction?

Answer 10

No, they go in opposite directions

Question 11

True or False: Current is a scalar

Answer 11

False

Question 12

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

Answer 12

True

Question 13

Define voltage

Answer 13

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

Question 14

What are the symbols for voltage?

Answer 14

V or v

Question 15

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

Answer 15

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

Question 16

True or False: Voltage is a vector

Answer 16

False

Question 17

Define power

Answer 17

The work done to charge per unit time

Question 18

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

Answer 18

Scuffed: P=VI

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

Question 19

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

Answer 19

Supplies, putting power into

Question 20

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

Answer 20

Dissipating from

Question 21

Define resistance

Answer 21

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

Question 22

What is the symbol for resistance?

Answer 22

R

Question 23

Define capacitance

Answer 23

The charge stored per change in voltage

Question 24

What is the symbol for capacitance?

Answer 24

C

Question 25

Define inductance

Answer 25

The voltage per change in current

Question 26

What is the symbol for inductance?

Answer 26

L

Question 27

What is the SI unit for charge?

Answer 27

Coulomb, C

Question 28

What is the SI unit for current?

Answer 28

Ampere, A

Question 29

What is the SI unit for voltage?

Answer 29

Volt, V

Question 30

What is the SI unit for power?

Answer 30

Watt, W

Question 31

What is the SI unit for capacitance?

Answer 31

Farad, F

Question 32

What is the SI unit for inductance?

Answer 32

Henry, H

Question 33

Define circuit element

Answer 33

Any device wired into the circuit

Question 34

Define terminal

Answer 34

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

Question 35

Define node

Answer 35

An electrical connection between two or more circuit elements

Question 36

Define circuit diagram

Answer 36

A representative schematic of the physical circuit

Question 37

Define ideal wire

Answer 37

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

Question 38

Define ideal voltage source

Answer 38

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

Question 39

Define ideal current source

Answer 39

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

Question 40

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

Answer 40

True

Question 41

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

Answer 41

Open circuit

Question 42

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

Answer 42

Short circuit

Question 43

Define open circuit voltage

Answer 43

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

Question 44

Define short circuit current

Answer 44

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

Question 45

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

Answer 45

True

Question 46

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

Answer 46

False

Question 47

Define dependent voltage source

Answer 47

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

Question 48

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

Answer 48

True

Question 49

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

Answer 49

True

Question 50

Define v-i diagram

Answer 50

Measures the performance of a circuit element

Question 51

Define Kirchhoff's Current Law

Answer 51

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

Question 52

Define Kirchhoff's Voltage Law

Answer 52

The sum of all voltages around a loop is zero

Question 53

Define Tellegen's Theorem

Answer 53

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

Question 54

Define ground

Answer 54

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

Question 55

Define supply

Answer 55

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

Question 56

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

Answer 56

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

Question 57

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

Answer 57

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)

Question 58

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

Answer 58

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

Question 59

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

Answer 59

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