# Circuit Fundamentals Flashcards

1
Q

Ohm’s law

A

Current (I) is a proportion of voltage (E) and resistance (R)

2
Q

What is the mathematical expression of Ohm’s law?

A

I = E/R

3
Q

What is the basic power formula/Watt’s law?

A

The rate at which a load consumes energy is determined by current and voltage.

4
Q

What is the mathematical expression of Watt’s law?

A

P = E x I

5
Q

What is the mathematical formula for work?

A

W = P (a certain amount of power) x t (applied for a certain period of time)

6
Q

In a series circuit, the total resistance is equal to ________.

A

The sum of the individual resistance within the circuit

7
Q

In a series circuit, the current is ________.

A

The same throughout

8
Q

The total voltage at the source of a series circuit is equal to _______.

A

The sum of the voltages at each of the resistor

9
Q

What is the main disadvantage of series circuits?

A

A fault in the circuit stops the current in the entire circuit.

10
Q

Branch

A

A pathway in a parallel circuit

11
Q

What is the main advantage of parallel circuits?

A

A fault in any branch of the circuit doesn’t stop the current to other branches

12
Q

The voltages across all branches of a parallel circuit are equal to _______.

A

The Source Voltage

13
Q

The total current in a parallel circuit is equal to ___________.

A

Sum of the current flowing through each branch

14
Q

The total resistance in a parallel circuit is ________________.

A

The reciprocal of the sum of the reciprocals of the separate resistances in parallel.

15
Q

Complex circuit

A

Combines loads in parallel with loads in series in a single circuit

16
Q

How do we analyze complex circuits?

A

By reducing the parallel circuits into an equivalent series circuit

17
Q

As Current (I) increase, resistance __________

A

Decreases

18
Q

Describe the Ohm’s Triangle

A
19
Q

Current (I)

A

The continuous flow of free + electrons through a conductor

20
Q

Voltage (V)

A

The motivating force, PRESSURE, causing electrical current

21
Q

Current (I) is measured in …

A

Amps

22
Q

As current increases, voltage…

A

Increases

23
Q

Electron current flows from

A

Negative to Positive

24
Q

Electron current flows from???

A

Negative to Positive

25
Q

Voltage is expressed as…

A

V or I

26
Q

Electric current is measured in…

A

Amps

27
Q

Voltage is measured in…

A

Volts

28
Q

Resistance is measured in…

A

Ohms

29
Q

Voltage and Resistance are a measure of…

A

potential difference “between” or “across” two points in a circuit

30
Q

The standard unit of measure of resistance is the …

A

Ohm

31
Q

The standard unit of measure current is the…

A

Amp

32
Q

Power is a measure of???

A

The amount of work that can be performed in a given time

33
Q

Work is the amount of???

A

weight lifted against gravity

34
Q

Power is the measure of ???

A

The speed of a standard amount of work

35
Q

Power is a function of???

A

Voltage and Current

36
Q

Electrical power is measured in???

A

Watts

37
Q

kW

A

1,000 Watts

38
Q

1 HP =

A

745.7 Watts

39
Q

The formula for Power (P) is…

A

P=IE

40
Q

The formula for electrical power (Watts) is…

A

Watts = Amps x Volts

41
Q

If current and resistance is known, Power =

A
42
Q

If voltage and resistance are know, Power =

A
43
Q

Conventional current direction flows???

A

Positive to negative

44
Q

The symbol for a Resistor is…

A
45
Q

The symbol for a Capacitor is…

A
46
Q

The symbol for an Inductor is…

A
47
Q

3 Current-Voltage/time circuit elements?

A

Resistor, Capacitor, Inductor

48
Q

The formula for Resistance (R)

A
49
Q

The formula for Capacitance (C)

A
50
Q

The formula for Inductance (L)

A
51
Q

The symbols for Constant Voltage…

A

The symbol on the left is used for a battery. The circle symbol represents some other source of voltage, often a power supply.

52
Q

The symbol for Constant Source…

A

The arrow indicates the direction of positive current flow

53
Q

The symbol for Variable Voltage Source…

A
54
Q

Variable Voltage Equation

A

v = v(t)

55
Q

Constant Voltage Equation

A

v = V

56
Q

Constant Current Equation

A

i = I

57
Q

The formula for power in a resistor

A
58
Q

The formula for energy in a capacitor

A
59
Q

The formula for energy in an inductor

A
60
Q

A node is a…

A

A junction where 2 or more elements connect in a circuit

61
Q

A branch in a circuit…

A

the connections between nodes

62
Q

Mesh is…

A

A loop that has no other loops inside it

63
Q

Loop…

A

the number of meshes and closed paths in a circuit

64
Q

Reference Node

A

Voltage is measured relative to the reference node

65
Q

2 common Reference Nodes are

A

1) - terminal of the voltage or current source
2) the node connected to the greatest number of branches

66
Q

Ground is the reference point from which ________ is measured

A

Voltage

67
Q

The return path for electric current back to its source is…

A

Ground

68
Q

The direct physical connection to the Earth

A

Ground

69
Q

Common Ground symbols

A
70
Q

To be equivalent, two schematics must:

A

Represent every component and source
Have the same number of nodes
Each node must be connected to the same branches

71
Q

A passive component does not …

A

Create power or amplify a signal

72
Q

Series Resitors are connected …

A