Electronics: Currents and Circuits

Question 1

What are the two modes that current can travel in?

Answer 1

Alternating and Direct Current

Question 2

Most electronics are powered by…

Answer 2

DC

Question 3

What kind of current is provided by batteries?

Answer 3

DC

Question 4

Differences between AC and DC

Answer 4

DC only travels in one direction, negative to possitive. Flow and polarity is constant.

AC alternates its flow direction, polarity.

Question 5

What kind of current do most households receive?

Answer 5

AC

Question 6

Why are households provided with AC?

Answer 6

AC is easier to transmit across greater distances at large vlotages, without burning the cables.

Question 7

What kind of current is used by houses that are off the grid?

Answer 7

DC, as they are the power generated are stored in DC batteries

Question 8

What sort of things are commonly associated with DC

Answer 8

Batteries
Electronics
Telecomunications
Off the grid houses

Question 9

What are the characterestics on a wavform?

Answer 9

Amplitude
peak amplitude
cycle
period
frequency

Question 10

Amplitude

Answer 10

The measurement of any point of the wave that is either above or below the mean line

Question 11

Peak Amplitude

Answer 11

the point of the wave that is farthest from the mean line, possitive or negative.

Question 12

Cycle

Answer 12

One complete evolution of a wave’s shape

Question 13

Period

Answer 13

The amount of time it takes to complete on cycle. Symbol is T. Measured in seconds and milliseconds

Question 14

Frequency

Answer 14

The number of complete cycles in a given amount of time. Symbol is f, and is measured in Herz(Hz)

Question 15

One Hz is equal to…

Answer 15

One cycle per second.

Question 16

What is the frequency of AC delivered to households in America?

Answer 16

60Hz

Question 17

What is the relationship between frequency and period?

Answer 17

f = 1/T

T = 1/f

Question 18

What device can be used to see or visualize waveforms?

Answer 18

oscilloscope

Question 19

What is an Altenator?

Answer 19

An AC generator

Question 20

What are the two parts of a generator

Answer 20

The rotor and stator

Question 21

Different kinds of waveforms

Answer 21

Sine, Square, Sawtooth, and Triangle

Question 22

Which waveforms are the most common in electronics

Answer 22

Sine and square

Question 23

Which waveforms are used in cathode ray tubes and vocal harmonics

Answer 23

Sawtooth

Question 24

What is phase?

Answer 24

The relationship between two waves.

Question 25

When are waves in phase?

Answer 25

When they overlap

Question 26

What is phase shift?

Answer 26

If two waves are of the same frequency and voltage but don't overlap, they have a phase shift. The first wave is called the leading wave, the next wave is the lagging wave.

Question 27

What happens with a 180 degree phase shift?

Answer 27

The two waves cancel eachother out.

Question 28

Why is peak possitive and negative voltage important?

Answer 28

Because it allows us to unsure that any circuits we design can tolerate the peak voltages

Question 29

What is peak voltage?

Answer 29

Voltage measured at the highest or lowest point of the wave. Abreviated P or PK

Question 30

What is Peak to Peak voltage?

Answer 30

The combined amplitude from peak possitive to peak negative. Abreviated PP

Question 31

How to caluculate the average voltage of an ac current?

Answer 31

Mulitply the peak voltage with 0.636

Question 32

How to calculate the DC equivalent or root-mean-square/effective voltage?

Answer 32

Peak Voltage X 0,707

Question 33

A device that converts AC to DC

Answer 33

Rectifier

Question 34

A device that converts DC to AC

Answer 34

Inverter

Question 35

Why is it important for a circuit to offer resitance resulting a voltage drop?

Answer 35

Heat will be produced as a result of friction along the circuit. The heat can damage the circuit and the chemicals in the battery, causing a short circuit

Question 36

What is an overloaded circuit?

Answer 36

A circuit to which too much power is provided, leading to overheating and damage to the components, or even fire or and explotion

Question 37

What are two types of protective devices used to prevent a short circuit

Answer 37

Fuses and circuit breakers

Question 38

What are the three different kinds of circuits

Answer 38

Series, Parallel, and Series-Parallel

Question 39

Difference between a Series and Parallel circuit?

Answer 39

A series circuit moves the current through the components sequentially. A parallel circuit allows the current to flow down two or more paths simultaneously to do more than one operation.