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DT GCSE > Electronics - GCSE DT > Flashcards

Electronics - GCSE DT Flashcards

1
Q

What is a systems diagram?

A

A schematic that shows the different stages of a system or process

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2
Q

What does a open loop system have/ doesn’t have?

A

It doesn’t have feedback (e.g. light switch)

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3
Q

What does a closed loop system have/ doesn’t have?

A

It has feedback (e.g. heating system)

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4
Q

What is the meaning of physical quantity for input transducers?

A

Anything that can be measured. (e.g. light, time…)

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5
Q

What is a LDR?

A

A resistor that changes the resistance depending on how much light comes in.

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6
Q

What is a photodiode?

A

Current flows in one direction, when there isn’t light it’s an insulator, with light current flows.

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7
Q

What is a phototransistor?

A

A switch which turns on with light.

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8
Q

What is a lamp?

A

Current can flow in any direction, insufficient as it gets hot

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9
Q

What is a LED?

A

Must go in a certain way, different types

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10
Q

What is a microphone?

A

Detects sound

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11
Q

What is a heating element?

A

Uses resistance to make heat, requires large amount of current

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12
Q

What is a fan?

A

Used for cooling, effectively a motor

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13
Q

What is an output transducer?

A

Converts electrical signal into a physical quantity

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14
Q

Why do we need an output transducer?

A

We can’t see what happens within the circuit so the information is translated into something we can use

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15
Q

Why are output drivers needed?

A

To increase the current so an output works

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16
Q

What ways are transistors used?

A

Amplifier or switch

17
Q

Why are potential dividers used?

A

They are used to divide the input potential (voltage) or output voltage down (to reduce it)

18
Q

What is a thermistor?

A

When temperature increases resistance decreases

19
Q

What is a PIR?

A

Uses heat signals to detect movement

20
Q

What is a magnetic reed switch?

A

Uses magnet to close switch completely

21
Q

What is a vibration?

A

Detects vibration and spring hits metal casing to complete circuit

22
Q

What is an ultrasonic?

A

Sends and receives signals to detect any solid object

23
Q

What is a DC motor?

A

High rpm, requires a lot of current

24
Q

What is a solenoid?

A

Linear rotation

25
Q

What is a servo?

A

Tiny motors with lots of gears, very useful

26
Q

What is a speaker?

A

Takes a frequency and sends it back as a sound

27
Q

What is a buzzer?

A

Lower pitch, not as loud as siren

28
Q

What is a siren?

A

High pitch, loud

29
Q

What is a piezoelectric sounder?

A

Makes different tunes or sounds

DT GCSE (10 decks)

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