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Answer 38
+V
+V
+V
Load
NPN
Switch sourcing current
to transistor
Switch sinking current
from transistor
Transistor sourcing
current to load
Transistor sinking
current from load
PNP
Load
Follow-up question: explain why neither of the following transistor circuits will work. When the
pushbutton switch is actuated, the load remains de-energized:
+V
+V
+V
Load
Load
120