Using Electricity

Using Electricity

by Hòa Trung

​Transducer

​A transducer is a device that receives a signal in the form of one type of energy andconverts it into another form of energy.

​Transducer

​A transducer is a device that receives a signal in the form of one type of energy andconverts it into another form of energy.

Sound to Electricity (electric signal)

Electricity to Mechanical energy

​Using transducer

​Most complex electrical circuits can be understood as a combination of input and output transducers separated by some form of signal-processing circuitry

​Signal-processing components

1. ​Potentiometer: consisting of a three-terminal resistor with a sliding orrotating contact called the wiper.

2. ​Potentiometer can be used as

• ​a simple variable resistor.

• ​a voltage divider.

​Input transducer

​Thermistor : A thermistor is a type of variable resistor. The resistance of the thermistor, however, depends on its temperature.

​Input transducer

​Light dependent resistor: is an input transducer that provides a variable resistance in the circuit. As its name suggests, a light-dependent resistor (also known as an LDR or photoresistor) is a transducer whose resistance depends onthe amount of light falling on it.

Usually an LDR is designed to have a very highresistance in the dark (for example a few million ohms). In the light, their resistancecan drop as low as a few hundred ohms.

​Input transducer

Diodes: A diode is a semiconductor device that has the special property that it will only allow electrical current to flow through it in one direction.

​Input transducer

Diodes: A diode is a semiconductor device that has the special property that it will only allow electrical current to flow through it in one direction.

​It's a polarized device.

​Output transducer

Diodes: A diode is a semiconductor device that has the special property that it will only allow electrical current to flow through it in one direction.

Multiple Choice

the main two types of resistors are

• fixed and variable

• LDR and LED

• Potentiometer and LDR

• Fixed and colored

Multiple Choice

when light increase the LDR value

• increase

• decrease

• does not change

Multiple Choice

LED is a polarized component

• true

• false

Multiple Choice

They are _____

• diodes

• microphone

• potentiometer

Multiple Choice

the transducer is a device that changes the voltage for example from 6 V to 12 V.

• True

• False

Multiple Choice

resistors in the image are connected in

• parallel

• series