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DP Tool Club 26
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BB72.ASC
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1992-04-25
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ELECTRONICS is a discussion of simple relationships with
voltage, current, impedence, and power.
1. Current is the rate of electron flow in a circuit and
is measured in amps ( AC or DC ). Lots of current flow
is designated as high current.
2. Voltage is responsible for pushing electric current
( pressure ) through a circuit and is measured in volts
( AC or DC ). A high voltage wants to push current but
may not be able to if there is limited battery current
capacity.
3. Resistance "resists" the flow of current in a circuit
and is measured in ohms. A large resistor has a high
resistance to electron flow. Resistors in parallel
lower the final resistance; in series raises the
resistance. For example, two four-ohm speakers in
parallel yields a two-ohm load; two four-ohm speakers
in series yields an eight-ohm load.
4. Voltage, current, and resistance are mathematically
linked through Ohm's Law stating: V(voltage) =
I(current) X R(resistance).
5. Power represents the product of pressure (voltage)
times electron movement (current), P = V x I and is
measured in watts.
6. A battery produces direct current (DC) but audio coming
out of an amplifier is alternating current (AC) which
is actually alternating positive and negative voltage
which then induces forward/backward electron movement
at the speaker.
7. Capacitors block the flow of DC, yet pass through AC
signals. They are measured in microfarads (mfd).
Inductors ( aka, coils ) pass DC but block AC signals.
They are measured in milliHenrys (mH).
More information and examples on this subject are in the
BLAUBOX user's manual.