Chapter 4.2 - 'Using Electricity' Flashcards
Define a ‘transducer’.
A device that receives a signal in the form of one type of energy and converts it into another form of energy.
Give an example of a input transducer.
A microphone.
The microphone converts sound energy into an electrical signal.
Give an example of an output transducer.
A light globe
The globe converts electrical signals into heat and light energy.
Give an example of signal processing circuitry
Wires connecting a battery to a globe.
The energy is carried from one transducer to another.
State what a ‘potentiometer’ is.
A variable resistor with a third adjustable terminal.
Holds a sliding or rotating contact called the ‘wiper’.
Explain how a ‘wiper’ works.
The further the wiper slides or rotates, the greater the resistance value.
Give examples of what potentiometers are used for.
Light dimmer switchers.
Volume control.
Sound systems.
State what happens to the resistance of LDR’s when it gets darker.
It increases.
List what LDR’s are used for.
Camera light meters,
street lights,
night light,
doorbell chimes.
