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Electronics - Term 1 > Work Package 1 > Flashcards

Work Package 1 Flashcards

1
Q

what are mechanical switches?

A

hand operated components used for making or breaking the flow of electrical current in a circuit

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2
Q

What does SPST stand for?

A

single pole single throw

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3
Q

what is a single pole single throw? (SPST)

A

the simplest type of switch, it only has one pole and one contact. It can be thrown into only one contact position.

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4
Q

what is the SPST available as? (2)

A
  1. Push to make switch (PTMS)

2. Push to break switch (PTBS)

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5
Q

what does SPDT stand for?

A

single pole double throw

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6
Q

what is a single pole double throw? (SPDT)

A

has one pole and two contacts and can be thrown into either of two contact positions

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7
Q

what does DPDT stand for?

A

double pole double throw

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8
Q

what is double pole double throw? (DPDT)

A

has two poles and four contacts and is the same as having two single pole double throw switches in one package.

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9
Q

what is the same as having two single pole double throw switches (SPDT)?

A

a double pole double throw

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10
Q

what can a DPDT be used as? (2)

A
  1. can be used for connecting two circuits at the same time

2. for reversing the polarity of electric motors

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11
Q

what are batteries? (2)

A
  1. safe, self-contained energy sources that convert chemical energy into electrical energy
  2. are available in several sizes and voltages, which have different internal properties that make them suitable for particular uses
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12
Q

what are the four things to consider when selecting a battery?

A
  1. the power requirements of your circuit
  2. its voltage and type
  3. the physical size of the battery
  4. how much you’re willing to spend
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13
Q

what are 5 battery types?

A
  1. zinc carbon
  2. alkaline
  3. silver oxide
  4. lithium (non-rechargeable)
  5. nickel cadmium (rechargeable)
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14
Q

what are resistors?

A

common non-polar components in electronic circuits. They are used to limit the amount of current flowing in the circuit and to set the voltage levels in certain parts of the circuit.

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15
Q

what is an ohm?

A

a unit of measurement for resistance

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16
Q

what do the four bands of colour on a resistor show?

A

their resistance value

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17
Q

how do you read the resistor value?

A

hold the resistor with the single gold or silver tolerance band on the right.

18
Q

what does a silver band on the resistor indicate?

A

tolerance of plus/minus 10%

19
Q

what does a gold band on the resistor indicate?

A

tolerance of plus/minus 5%

20
Q

resistors with a silver tolerance band of plus/minus 10% belong in which series?

A

the E12 series

21
Q

resistors with a gold tolerance band of plus/minus 5% belong in which series?

A

the E24 series

22
Q

where is the maximum resistance value found?

A

on the variable resistor’s body

23
Q

how is the resistance value of potentiometers (potential dividers) or variable resistors changed?

A

by moving the wiper along the resistance track

24
Q

what does a current limiting resistor do?

A

limits the current and prevents components from being damaged.

25
Q

what components can be protected using a current limiting resistor? (2)

A

light emitting diodes (LEDs) and transistors

26
Q

what is the ohms law formula? (given)

A

voltage = current x resistance

27
Q

what is current measured in?

A

amps

28
Q

what is resistance measured in?

A

ohms

29
Q

resistors can be connected in two different ways, what do these two ways give?

A
  1. different total values of resistance

2. divide voltage or current

30
Q

when resistors are connected in series, what is true for the resistors values?

A

the total resistance is equal to the sum of the separate resistors

31
Q

what is the formula for calculating the total resistance of resistors in series? (given)

A

Rtotal = R1 + R2 +R3

32
Q

when resistors are connected in parallel, what is true for the resistors values?

A

the voltage across each resistor is the same, and the current flowing through each separate resistor is dependent upon the resistance. The total resistance is always smaller than the smallest individual resistance.

33
Q

what is the formula for calculating the total resistance of resistors in parallel? (given)

A

Rtotal = R1 x R2 / R1 +R2

34
Q

what is the formula for voltage out? (Vout) (given)

A

(R2/ R1 + R2) x Voltage supply

35
Q

what are LEDs?

A

light emitting diodes

36
Q

how do LEDs give out light?

A

when current passes through them

37
Q

how many directions do LEDs allow current to flow?

A

one direction

38
Q

what are the two leads on the LED called?

A

an anode and a cathode

39
Q

what is the shorter lead on the LED called?

A

the cathode

40
Q

what are tri-coloured LEDs?

A

two anodes and one cathode

Electronics - Term 1 (5 decks)

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