Laws & Equations Flashcards

1
Q

Faradays Law:

A

The magnitude of the EMF Is directly proportional to the rate of change of flux (Applies to generators)

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

Lenz’s Law:

A

An inducedelectric currentflows in a direction such that the current opposes the change that induced it

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

Kirchhoff’s Voltage Law

A

The sum of the voltage drops around a single closed path equals the sum of the voltage sources

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

Kirchhoff’s Current Law

A

At any point in an electrical circuit, the sum of currents flowing towards that point is equal to the sum of currents flowing away from that point

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

Ohms Law

A

V=IR

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

Power Law

A

P=IV

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

Left hand rule

A

Electric motors

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

Right Hand rule

A

Electric Generators

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

EMF Equation

A

EMF = BLV

B = Magnetic Field 
L = Length of the object moving 
V = Speed
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Conductance Equation

A

Conductance (G) = 1/R

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

Internal resistance equation

A

Internal resistance = OCV - CCV
-—————
I

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

Power Equation’s

A

P = I^2 x R

P = V^2/R

P = V x I

P = Amps x Volts

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

1 watt =

A

1 Joule per second

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

Charge (Q) Equation:

A

Q = Capacitance x Voltage

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

Time constant Equation:

A

5 x R x C

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

MMF Equation:

A

MMF = Amps x Turns

17
Q

Capacitance Equation:

A

C = KA/d

KA = Dielectric Constant 
d =  Distance plates apart
18
Q

Field Strength Ident.

19
Q

Flux Density Ident.

20
Q

Field Strength Equation:

A

H = I x N / L

I = Current
N = Number of turns 
L = Length
21
Q

Magnetic Flux density (B) Eqution

A

B = H x permeability

H = Magnetic field Strength

22
Q

Magnetic Flux equation

A

Flux = B x A

A =  Pole Area 
B = Flux density
23
Q

Power in a motor equation:

A

Torque x 2pi x rev/sec

24
Q

Torque equation:

A

Force x radius

25
Permeability equation
Permeability = flux density / magnetic field strength
26
Average voltage =
Average voltage = 0.63 x peak value
27
True power =
TP = V x I x PF
28
Form Factor =
Form factor = RMS/Average
29
RMS =
RMS = Peak voltage x 0.707 Or RMS = peak voltage / 1.414
30
Energy stored in a capacitor =
0.5 x C x V^2
31
Inductive Resistance =
2 Pi x frequency x inductance