2007-07-17 06:23:39 · 4 answers · asked by srinivasan j 1 in Science & Mathematics ➔ Engineering
It is modeled as a 2-port "black box", where the input terminals accept a current (and are modeled by 'zero' resistance to that current), and the output is a function of the input current. the output may be a voltage or current (or other varying physical parameter, such as resistance).
A bipolar transistor is well modeled as a current controlled device. The collector (output) current is a function of the base current: Ic = Beta * Ib.
The hybrid-pi model changes that from a current controlled device to a voltage controlled device: Ic = F(Vbe), but the BJT transistor is still basically a current controlled device.
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2007-07-17 06:35:05 · answer #1 · answered by tlbs101 7 · 1⤊ 0⤋
you mean , you are not stated where it is used .Any way I will explain current control for a simple circuit used for circuit protection or a distribution feeder protection - example thermal over load relays for motor protection for it specified current.If it get over loaded to the set current it will trip the motor unless it will burn. In simple way MCB's miniature circuit breakers also used for fixed current, If any over load occurs it will trip the particular faulty circuit.
same ways in power generation, generator field current can be controlled to achive the required output voltage (or power ) by means of thyrister contol.
In simple way fan speed can be contolled by regulator it s also a simple current controller.
In other examples Rheostat (Variable resistor) also simple current controll divice.current controll is used to protect the circuit components. I hope I have given little, if u specify the area I would have been given more or pm me
2007-07-17 06:54:02 · answer #2 · answered by ricky414 5 · 0⤊ 0⤋
A device whose output is proportional to the amount of current input into it -- a BJT transistor, for example.
2007-07-17 06:31:14 · answer #3 · answered by Randy G 7 · 1⤊ 0⤋
Current controlled devices are those, whose output characteristic depends on input current
Voltage controlled devices are those whose output depend on input voltage.......
We have to see the output of the device and examine weather its output depend on input current or input.
https://www.electrikals.com/
2015-10-30 19:44:27 · answer #4 · answered by Robert 4 · 0⤊ 0⤋