Section three

Question 1

What are the two ways to calculate voltage?

Answer 1

V*I
or
V squared divided by resistance
or
I squared * R

Question 2

What are Power Ratings

Answer 2

How much power a component can take before something bad happens
This is normally calculated in watts

Question 3

What happens to voltage and amps on series vs parallel circuits?

Answer 3

Series - voltage divides, current stays the same

Parallel - voltage stays the same, current divides

Question 4

Which is more natrual, AC or DC?

Answer 4

DC, it was also discovered first, it is found in nature

Question 5

What is a rectifier?

Answer 5

Converts AC to DC

Question 6

Why do power companies use AC voltage

Answer 6

DC can’t be converted to higher voltages

Transformer step up voltage in AC and then step them back down so we can send energy longer distances

If DC were to carry the amps from one place to another it would need one long cable and the resistance would give a decent power loss.

AC can use transformers which decreases amps and picks up volts, this gives us a much lower voltage drop

AC

Question 7

How does AC work

Answer 7

When the hill is high the current flows in one direction and vice versa

Question 8

What is frequency in AC

Answer 8

How many times the wavelength hits zero (in between neg and pos)
How many times it oscillates

Question 9

What is 40 Hz?

Answer 9

The signal passes 0 40 times a second

Question 10

What are AC frequencies made up of

Answer 10

Amplitude (peak voltage) - max voltage reached by the signal, it is measured in volts (). Negative voltage just means current is going the other way.

peak-peak voltage - twice the peak voltage. (just a measurement of peak to peak)

Time Period - time taken for signal to complete one cycle. Measured in seconds. Often shorter though. Full cycle is one pos peak, one neg peak and back to zero.

Frequency - number of cycles per second, measure in hertz Hz

Question 11

What are the equations for frequency and time period

Answer 11

frequency = 1/time period

time period = 1/frequency

Question 12

What is RMS voltage?

What are the equations for peak and RMS voltage?

Answer 12

Root Mean Square Voltage
It is the equivalent steady DC value which gives the same effect.

It’s 0.7 of peak voltage
We use this because the voltage is not at the peak voltage constantly.

Vrms = 0.7 * Vpeak
Vpeak = 1.4*Vrms

Only true for sign waves (most common)

Question 13

If you put your multimeter in an outlet, what voltage will it show?

Answer 13

RMS voltage