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Why diode is active device when all other active devices require external power supply?
Wiki User
∙ 15y ago
A Device is said to be active if...
(i) It is a source of Power in the circuit...
(ii) It amplifies any voltage or current in a circuit...
(iii) It acts as a switch ie., has modes equivalent to ON and OFF...
e.g., transistor amplifies and can also act as a switch...
Wiki User
∙ 15y ago
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What is active devices?
An active device amplifies the signal by some value - such as an active filter using an OPAMP. A passive device does not provide any amplification - such as a passive filter network of inductors and capacitors.
What is active pull up in TTL NAND gate?
All standard TTL devices use a two transistor "totempole" output, one transistor provides an active pull down and the other an active pull up. Only one of these transistors is on at a time and one or the other is always on. Open collector TTL devices omit the active pull up transistor so that several outputs can be "wired" together and an external resistor provides a passive pull up. The only problem with this is the risetime of a passive pullup is much longer than the risetime of an active pull up, making the circuit slower. Tristate TTL devices have the same two transistor "totempole" output as standard TTL devices, but the circuits that control these transistors are more complex allowing a "third state" in which both transistors are turned off, leaving the output of the device floating. This allows many tristate TTL devices to be connected to a single line with only one actually driving it at a time (preventing conflicts with one device pulling up and another pulling down).
What causes a damage or alters a pn junction diode?
A: A devices whether active or passive have a power dissipation limits. By abusing this limit the device can become faulty and unreliable
A potentiometer is a active device or passive device?
passive
What is a dc jack?
A DC jack exists for the purpose of supplying direct current to a device from an external source, as opposed to the batteries inside the device. The external DC power would likely come from an AC to DC adapter that you plug into the wall. Such a jack can also work with car adapters too, provided it it converted to the correct voltage. So using an external source keeps you from using the batteries. With some equipment, that can charge the battery as well, but devices using disposable batteries are wired as to not charge the batteries.
Difference between active and passive devices?
Active device: A device that requires an external source of energy to be ready for operation and has an output that is a function of present and past input. e.g, Diodes, Transistors, PN and PIN junctions, ICs and varactors etc. we have to apply an external voltage usually called as Vcc, to these devices before placing in circuit network. Passive device: A device that does not require a source of energy for its operation. e.g, such as Resistors, Capacitors, Inductors, etc. We place thses devices in the circuit, network without applying any external voltage.
What is th purpose of secondary device?
Secondary storage device is USB and also the external hard disk are external devices these are best for external memory.
What is the function of external device?
External devices can carry out all sorts of different functions.
What device is usually connected to a PC after its device drivers are installed?
A Plug-N-Play device More information: Most USB devices, (printers, NICs, etc...) require pre-installed drivers for numeration before the device is connected. Things like keyboards, mice, and thumb drives, some external storage devices, do not require drivers because they are native to most OS's
What is internal device?
That is a device that is inside the computer. An internal hard drive, for instance, is physically mounted inside the computer. It is not made to be used outside the computer, though there are kits to convert internal hard drives into external drives. There are external storage devices that are made to plug into a USB port. External devices either require their own power supply, or they get power from a USB socket. Internal devices get their power from the power supply which is already in the computer.
What type of device when installed is not listed in bios setup device manager or the printers windows?
External Devices
What is the use of external device?
External devices are used for storage just like internal devices but with the added bonus of being portable and not requiring space inside your computer. This usually comes at the sacrifice of access time or write times. Depends on the interface used for the external device.
What basic principle applies to both internal and external devices?
For most installations, install the device first, then the device driver.
No, The port on an ipad is a device port, not a host port. You would have to get a USB on the go adapter for iPad to connect external devices.?
No, The port on an ipad is a device port, not a host port. You would have to get a USB on the go adapter for iPad to connect external devices.
What is active devices?
An active device amplifies the signal by some value - such as an active filter using an OPAMP. A passive device does not provide any amplification - such as a passive filter network of inductors and capacitors.
What is a universal cradle?
It's a mounting device or a convenient extended cable to mount devices. For example, a mounting device to plug in a USB or a mounting device to place a external hard drive or a cd/dvd external drive.
Is a keyboard internal or a external devise?
External. Internal devices would be something like a CD Drive, while an external device is a keyboard or mouse for example.
