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TD > Eletronics > Flashcards

Eletronics Flashcards

1
Q

What is voltage

A

The force that makes electronics flow in a conductor is called voltage and it measured in volts

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2
Q

what is current

A

An electric current is a flow of electrons. When we measure current in a circuit we are measuring the number of electrons passing a given point in one second correct is measured in amps

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3
Q

What is resistance?

A

Resistance is a measure of how easisly electrons flow through a conductor, and it has measured in ohms

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4
Q

What is voltage is measured in?

A

Volts

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5
Q

What is current measured in?

A

Amps

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6
Q

What is resistance measured in?

A

Ohms

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7
Q

Symbol for voltage

A

V

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8
Q

Symbol for current

A

A

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9
Q

Symbol for resistance

A

Ω

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10
Q

What does mili mean

A

Thousandths

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11
Q

What does kilo mean

A

Thousands of

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12
Q

What does mega mean

A

Million

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13
Q

How is current measured

A

Measure is ammeter connected in series

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14
Q

How do you measure voltage?

A

Measured by connecting volt meters across the component

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15
Q

How do you measure resistance?

A

To accurately measure the resistance of a component removed from the circuit and measured, using a standard multimeter

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16
Q

What is an electrical conductor?

A

Materials that are suitable for carrying electrical current

17
Q

What is an electrical insulator?

A

Material that prevent electrical flow

18
Q

What is a semi conductive material?

A

It displays both conductive and insulating properties

19
Q

Name, three conductors

A

Gold
Copper
Brass

20
Q

Name three semi conductors

A

Silicone
Germanium

21
Q

Name, three insulators

A

Rubber
Glass
Plastic

22
Q

What does the input do

A

The input senses and reacts to specific changes

23
Q

What does the process do

A

The control reacts to changes I. The input and then controls or changes the output

24
Q

What does the output do

A

Output is switched on or off by the control part of the circuit

25
Q

How do you find the resistor colour band

A

To find the value of the resistor you read the colour bands from left to right. The first two bands state the first two digits of the value and the third band gives the number of zeros to be added. The final colour band gives the resistor tolerance.

26
Q

what are the two types of tolerance

A

silver and gold

27
Q

what is the tolerance for gold

A

plus or minus 5%

28
Q

what is the tolerance for silver

A

plus or minus 10%

29
Q

what does ohm’s law state

A

V=IxR

30
Q

what is the equation for potential divider circuits

A

V output = R2/R1+R2xVoltage supply

31
Q

what is a printed circuit board (PCB)

A

A PCB is an epoxy resin board with copper tracks

32
Q

what is a bread board

A

rows of copper tracks, covered by a layer of plastic with holes for components

33
Q

advantages of using a bread board before a PCB

A

Easy to make changes or tested different versions of a circuit they are able to be reused

34
Q

disadvantages of using a bread board before a PCB

A

more complexed to make, more expensive

35
Q

How to make a printed circuit board (PCB)

A

1 Design PCB layout

2 Use a UV light box to transfer the layout.

3 Develop layout using Sodium hydroxide/developer 30 seconds.

4 Rinse with water.

5 Etch away unwanted Copper, Do in an Etch tank Full of ferric Chloride

6 Rinse with water

7 Drill holes using a PCB Drill

36
Q

What are some safety precaution when making a PCB

A

rubber gloves for developing + Etching
Don’t look directly at the UV light
If acid gets on the skin, seek medical attention
PCB Drill –> long hair tied back, safety Goggles an also wear an apron

37
Q

How to make a printed circuit board (PCB) with router

A

1 Deigning layout

2 Load layout into router software

3 Put Board in machine and then into the router

4 Routes cuts/engraves the layout + holes.

TD (9 decks)

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