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Electronics: Ohm's Law


 
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Key Concepts

  Parallel and Serial Circuits
 
  Voltage Drops are always meaasured in parallel
  
  Current Flows are always measured in searial
          (must break the circuit to do this)

  Carbon is the single most common material
  for resistors. Usually coated in plastic.

  "Resistor Color Code"

  Not all materials (or geometric configurations)
  obey Ohm's Law. Then you use the Impediance Law
  which extends it.

     A loop of wire (an "inductor") generates
     a magnetic field. The symbol for a coil
     is "L".

     Two parallel plates of metal (a "capacitor")
     generates an electric field. The symbol for
     a capacitor is "C".

     "ELI the ICE man" 
       ^       ^


Going Further

Even a battery has an internal 
resistance. Design an experiment
to measure this. 


If instead of a battery (or other DC 
- direct current) source, we use a
AC (alternating current - eg, from
the wall outlet).

  R still acts the same,

  C and L do NOT (ELI the ICE man knows ;)

Capacitors can filter out noise.

Coils and capacitors can be used to
boost the base of an audio system.

"Resonance Circuit"


Much further afield

  Kirchov's Law

  Norton's Theorem

  Thevenin's Theorem




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