The source of electric current for a hand held transistor is _____ .

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Solution

The source of electric current for hand held transistor is cell or single compact $9 V$ battery.
Since transistor are used in portable CD player,radio,smartphone instead of bulky vacuum tubes as the amplifier elements because it required far less power to operate and was more shock resistant.
They could be fit in a pocket or held in hand and since it required less power so, the source of electric current is cell or single compact $9 V$ battery.

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