Raising the current to a circuit without switches

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StrawberryBro

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Hi , I am new to electronics and was conducting an experiment, I'm learning, I pose the following case:

Suppose we have a normal circuit, where an LED is powered by a source of 1V, we do not know the polarity of the source, and we want to raise the supply current of 1V to 20V without using switches and without removing the source of 1V .

What could be done?, This is a diagram I did, on the left there is the circuit without modification, and to the right, is a reference about how it should be.

**broken link removed**

Thanks
 

You simply use a DC power supply that can be adjusted from 1V to 20V.

Of course if that's an LED with no limiting resistance in series it will blow long before you reach 20V.
 

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