Difference between revisions of "Ohm's Law"

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R = \frac1{\frac1{R_1} + \frac1{R_2} + \dots + \frac1{R_n}}
 
R = \frac1{\frac1{R_1} + \frac1{R_2} + \dots + \frac1{R_n}}
 
\end{equation}
 
\end{equation}
 +
 +
\subsection*{Reading Resistor Values}
 +
 +
\begin{figure}
 +
\includegraphics[width=2in]{resistor_bands.png}
 +
\caption{Color band locations on resistors}
 +
\end{figure}
 +
 +
 +
\begin{figure}
 +
\includegraphics[width=2in]{color_chart.png}
 +
\caption{Matching colors to values}
 +
\end{figure}
  
 
</latex>
 
</latex>

Revision as of 13:05, 29 August 2012

Short Topical Videos

Reference Material

  • Horowitz & Hill, The Art of Electronics, 2nd Ed., Ch. 1

Ohm’s Law

where is voltage, measured in Volts (), with typical values ranging from (into an oscilloscope) to (power lines, severe arcing danger); is current, measured in Amperes (), typical values ranging from (relatively safe for bench-top work) to (very dangerous); is resistance, measured in Ohms (), typical values ranging from (power resistors dissipating a lot of power) to (almost a no-connect).

Resistor

Resistor.jpg


Symbol for a resistor in schematics

A resistor resists the flow of electrons, such that a potential (i.e. voltage) is required to produce a current, as described by Ohm’s Law above. As per all electronic components, resistors dissipate energy as heat according to the equation:

Resistors in Series

Resistors in series add:

Resistor series.png


Resistors in series

Resistors in Parallel

Resistors in parallel add reciprocally:

Resistor parallel.png


Resistors in parallel

Reading Resistor Values

Resistor bands.png


Color band locations on resistors

Color chart.png


Matching colors to values