Other Sensors and Transducers Control Devices Flashcards
These transducers are preferred when measuring the displacement (how much distance it covers), pressure, and other several physical quantities.
Capacitive Transducer
Dielectric medium in Capacitive Transducer
Air
The distance between these two metal plates and the positions of the plates can change the capacitance.
True/False
True
The basic difference between the normal capacitors and capacitive transducers is,
the capacitor plates are constant in normal capacitors wherein these transducers,
capacitor plates are the movable condition.
True/False
True
Are temperature sensors that
contain a resistor that changes resistance
value as its temperature changes.
Resistance Temperature
Detectors (RTDs)
As the temperature of a metal increases, so
does the resistance to the flow of electricity
True/False
True
Is used to measure the resistance of the current being passed through it
resistance element
Consists of two different materials with different expansion coefficients that are bonded together.
bimetallic strip
The first fundamental. States that the metals expand or contract based on variation in temperature
thermal expansion
The second fundamental. States that where each metal (having its temperature coefficient) expands or contracts differently at a constant temperature
temperature coefficient
Is a sensor whose resistance varies with applied force; It converts force, pressure, tension, weight, etc., into a change in electrical
resistance which can then be measured.
Strain gauge
When external forces are applied to a stationary object, _____ and _____ are the result.
stress and strain
Is defined as the object’s internal resisting forces, and strain is defined as the displacement and
deformation that occur.
Stress
Detect changes and disturbances in a magnetic field like flux, strength, and direction.
Magnetic sensors
Is an instrument that measures the distance to an object using ultrasonic sound waves. Uses a transducer to send and receive ultrasonic pulses that relay back information about an object’s proximity.
ultrasonic sensor
Are a timing device that measure
times of the changes in state of an infrared beam
that is blocked by a flag of known length, as
well as the times the beam is unblocked.
Photogates / Photogate Sensor
Are used all over that electrical or electronic circuits are utilized. They are found in submarines, computers, airships, TVs, ships, space vehicles, restorative disobedient, and many other places.
Circuit control devices
3 types of Control Devices
- Switches
- Relays
- Solenoid
2 Types of Switches
- Mechanical Switches
- Electronic Switches
Is a type of switch that must be
activated physically, by moving,
pressing, releasing, or touching its
contacts.
Mechanical switches
Types of Mechanical Switches
- SPST (Single Pole Single Throw)
- SPDT (Single Pole Double Throw)
- DPDT (Doble Pole Double Throw)
- Push Button
- Toggle Switch
This type of Mechanical switch has the most basic component. It has only one input and one output contact.
SPST (Single Pole Single Throw)
This type of Mechanical switch has two ON position as it has one input contact and two output contact
SPDT (Single Pole Double Throw)
This type of Mechanical switch, has two ON positions. It works like two SPDT operating at the same time.
DPDT (Doble Pole Double Throw)
A type of Mechanical switch that is a momentary contact switch that makes or breaks connection as long as pressure is applied (or when the button is pushed).
Push Button
Is actuated by moving a lever back and forth to open or close an electrical circuit.
toggle switch
Are generally called as solid-state switches because there are no physical moving parts and hence the absence of physical contacts.
electronic switches
Different types of solid-state switches
- BJT
- Diode
Is a type of electronic switch that works similar to the simple switches that allows and disallows current to flow through.
BJT
Can switch the circuit when the supply surpasses the barrier potential. Germanium
and silicon are usually used
Diode
Is a device that acts upon the same fundamental principle as the solenoid.
RELAY
Is the generic term for a coil of wire used as an electromagnet. It also refers to any device that converts electrical energy to mechanical energy using a solenoid. The device creates a magnetic field from electric current and uses the magnetic field to create linear motion
Solenoid
