What is one disadvantage of a transistor output compared to a relay output?
What is one disadvantage of a transistor output compared to a relay output?
– Transistors can behave as analog devices, allowing for signal amplification. – They’re much smaller than the equivalent relay. – Transistors are silent, and don’t indicate whether they are activated.
Why use a transistor instead of a relay?
Because a relay is a mechanical switch, it can be somewhat slow. A transistor is an electronic device that can work as a switch. It allows control of a large current by a smaller current as does a relay. Unlike a relay, however, a transistor is not mechanical, and can operate much faster than a relay.
Is transistor same as relay?
A Relay is an electrically operated switch. As a variable current switch, transistor can control output current based on input voltage. Relays and transistors have a similar basic function, that is, both play roles of electronic switches.
What is the output of a relay?
A relays Output Circuit is the portion of the relay that switches on the load and performs the same function as the mechanical contacts of electromechanical relays. Solid-state relays, however, normally have only one output contact.
What is the disadvantage of relay?
Disadvantages of relays: Relays are bulkier than transistors for switching small currents. Relays cannot switch rapidly (except reed relays), transistors can switch many times per second. Relays use more power due to the current flowing through their coil.
Is a relay output digital or analog?
When the digital switch is turned off, it returns to a default logic state. An analog switch acts like a solid-state relay (i.e., with no moving parts). Analog switches are able to pass or isolate both analog and digital signals, but digital switches can only pass or isolate digital signal lines.
What is the advantage of using a relay?
Advantages of relays: Relays can switch AC and DC, transistors can only switch DC. Relays can switch high voltages, transistors cannot. Relays are a better choice for switching large currents (> 5A). Relays can switch many contacts at once.
What can replace a relay?
Solid-State Triac Devices Replace Mechanical Relays In Power Switching Applications. Mechanical relays, contactors, and switches control the flow of electricity by the mechanical action of two conducting elements.
What is 12v relay?
The 12v relay is an electromechanical switching device which controls the AC devices through the DC power.
What is output of PLC?
PLC outputs are of two general types: (1) relay. (2) solid state. Relay outputs are mechanical contacts and solid state outputs may take the form of transistor or TTL logic (DC) and triac (AC). Relay outputs are usually used to control up to 2 amps or when a very low resistance is required.
Why relay is used in PLC?
Relays are used to isolate one voltage level from another. A PLC may be used to control the operation of a medium-voltage motor, perhaps 2,300V or 4,160V. A relay is used to energize the starter, which, in turn, switches the motor voltage while the PLC controls the relay.
What is the difference between relay and transistor outputs?
Transistor Output is a solid state configuration which can work at a fast rate. Relays are more electromechanical so they are slow. If you need to drive more current with the transistor output, you can always use a solid state relay.
What is the difference between a transistor and a resistor?
A resistor has a fixed amount of resistance which doesn’t change, it also only has two terminals, an input and an output, the output depending on the input and the resistance. A transistor is like a resistor except it’s resistance can be controlled by a second input called the base input, also of note,…
How does transistor function in a switch?
Transistors can also work as switches . A tiny electric current flowing through one part of a transistor can make a much bigger current flow through another part of it. In other words, the small current switches on the larger one. This is essentially how all computer chips work.
What is transistor as switch?
A transistor is used for switching operation for opening or closing of a circuit. This type solid state switching offers significant reliability and lower cost as compared with conventional relays. Both NPN and PNP transistors can be used as switches. Jun 26 2019