Variable load with stepless current draw

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manishanand14

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Hello Everyone!

I want to make a continuously variable load[resistive] which should draw current in the range 100mA-2A.

Voltage across the load 3-12V.
 
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This means you need a 25 watt load. (12V @ 2A). A 25 watt, 125 ohm rheostat that would do the job.

Are there more requirements?
 

Instead can I not use a suitable rating transistor in active mode.

The base current will decide the collector current which will flow through a resistive load.(Say a wire wound resistor of suitable wattage).
 

This means you need a 25 watt load. (12V @ 2A). A 25 watt, 125 ohm rheostat that would do the job.
Click to expand...
The unpleasant point is to require both 120 ohm and 2 A, which refers to a 480 W rheostat, unfortunately.
Instead can I not use a suitable rating transistor in active mode.
Click to expand...
Yes, the power rating (heatsink size) has to be selected according to the intended V and A combination.
 
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