TDC 311. Basic Electronic Circuits. Voltage. A battery / generator has + and  posts. Electrons flow through a circuit from the  post to the + post. The potential difference between the two posts is V, voltage. V is the push of electrons.
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Basic Electronic Circuits
+

Emitter (N)
Base (P)
Collector (N)
Microphone
Figure 8
Speaker
Base P blocks flow from emitter to collector.
Need to add a wire from base so electrons have some place to flow.
H=(4*pi*NumTurns2*AreaOfCoil*m) /
(LengthOfCoil * 10,000,000)
where m=permeability of core (air=2; steel=2000)