Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 29 - Molecules and Solids - Questions - Page 853: 16

Answer

The energy comes from the collector/emitter voltage source.

Work Step by Step

In Figure 29-41, it is the battery marked $\varepsilon_{C}$. The signal to the base controls how much current (and power) is supplied by the collector/emitter voltage source.
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