Home
rOm
Quest
Glossary
Random
Page
Search
Site
Lush
Sim
Class
Subject
Images
Help
FAQ
Sign
Up
Log
In
Transducers Convert Energy To or From Electrical Energy
Input Transducers or Sensors
These measure the world and generate a proportional electrical voltage or current.
There are many examples. Here a few ...
-
Sound - Microphone - Convert sound energy into a proportional voltage
-
Temperature - Thermistor - Convert temperature into a proportional voltage
-
Light - Light Dependent Resistor (LDR) - Convert light level into a proportional voltage
-
CCD sensor ( as used in digital cameras ). Charge Coupled Devices.
-
Angle - Potentiometer - Convert angular position into a proportional voltage
-
Pressure - The resistance of a piezo-resistive material changes when pressure is applied.
-
Moisture - Wet materials have a lower resistance that dry.
-
Presence - Switches - If an object is present it activates a switch or breaks a light beam, optical switch.
-
Ultrasound sensors can measure distance and movement.
-
Passive infra-red sensors are used to detect movement.
Output Transducers
Convert an electrical voltage or current into sound, light, movement or temperature. There are many examples. Here are several ...
-
Loudspeaker - Convert alternating electric currents into sound energy
-
Heater - Convert current into heat and cause the temperature to rise
-
LED or Bulb - Convert an electric current into light using a bulb, LED or other type of display.
-
Actuators - Convert an electric current into movement using a
-
solenoid - small straight line movements
-
motor - continuous spinning motion
-
stepper motor - precise angular stepped motion
-
servo - 90o movement controlled by a stream of pulses
Transducer Drivers
Most processing circuits can not provide enough power to drive motors, loudspeakers, lighting systems and so on. Drivers are needed to boost the small signal from the processing circuit. Drivers capable of working at larger currents and voltages include ...
-
Electromechanical Relays
-
MOSFETs
-
Bipolar Junction Transistors
-
Thyristors
-
Triacs
Categorising Input Transducers
|
|
Active Sensors - Contain Semiconductors
|
Passive Sensors
|
Analogue Sensors
|
-
Electret Microphone - contains an FET pre-amp
-
Accelerometer - Detect the orientation of a phone
|
-
Light Dependent resistor
-
Thermistor
-
Potentiometer
-
Moving Coil Microphone
-
Conducting Polymer - Changes resistance when deformed.
-
Hall effect sensor - Measures magnetic fields.
-
Capacitor - Capacitance changes with the input
-
plate overlap might change
-
plate spacing might change
-
material between the plates might change
|
Digital Sensors
|
-
Optical Switch - IR-LED with photodiode and a transistor switch
-
Shaft Encoders
|
-
Switch - Resistance = zero or infinity.
-
Microswitch
-
Reed Switch
-
Any kind of switch
|
Subject Name
Level
Topic Name
Question Heading
First Name
Last Name Class ID
User ID
Question Text
image url
Help Link
Add
Delete
Clone
Edit
Hardness
Help Text
Debug
- You can attempt a question as many times as you like.
- If you are logged in, your first attempt, each day, is logged.
- To improve your scores, come back on future days, log in and re-do the questions that caused you problems.
- If you are logged in, your most recent wrong answers get remembered. This might help you and your teacher to correct your understanding.
- In the grade book, you can delete your answers for a topic before re-doing the questions. Avoid deleting unless you intend re-doing the questions very soon.
