Inductors and Capacitors (Week 3)

Question 1

What is a Farad?

Answer 1

Measure of Capacitance.
microfarad = 10 ^- 6 farads
nanofarad = 10 ^-9 farads
picofarad = 10 ^ -12 farads

Question 2

Series capacitors

Answer 2

Take the overall reciprocal of capacitors in reciprocation..

1/ Ctotal = (1/c1 + 1/c2 + 1/c3…)

Question 3

Parallel capacitors

Answer 3

Add capacitors together…

Ctotal = c1+c2+c3+c4…

Question 4

Constant Current Integrator

Answer 4

When I (Current) is constant and C (Capacitance) is a fixed value, then there will be a line ramp slope (I/C) of charge until vCap is reached.

I = C * delta V/ Delta t
Vcap = I delta t/ C
Since I/C is a constant….
Vcap = KdeltaT

Question 5

To find a time constant in charge and discharge times.

Answer 5

RC integration for a charge and RC differentiation for discharge

Question 6

RC integration + differentiation formula

Answer 6

Tt = RC (Resistance * Capacitance)

Question 7

Charge Curves

Discharge Curves

Answer 7

The first time constant has the most dramatic change
Tt 1 = Vsource* (.63)

Tt 1 = Vsource* (.37)

Question 8

Electron theory of Magnetism

Answer 8

An electron is steady state has an electrostatic field. When put into motion, it creates a magnetic field - thus, electromagnetic materials such as iron, nickel and cobalt. (Electric and magnetic fields are 90 degrees out of phase with one another)

Question 9

Inductance

Answer 9

The ratio of magnetic flux (phi) to the electrical current (I)

L = phi / I

Measured in Henry’s

Question 10

Time constant for inductance

Answer 10

T = L/R (L = in henries and R in Ohms)

Question 11

Inductors in Series

Answer 11

1L +2L +3L…

Question 12

Inductors in Parallel

Answer 12

1/ Ltotal = (1/1L +1/2L…)