# Difference between revisions of "Ohm's Law"

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\section*{Ohm's Law} | \section*{Ohm's Law} | ||

+ | \begin{equation} | ||

+ | V=IR, | ||

+ | \end{equation} | ||

+ | where $V$ is voltage, measured in Volts ($V$), with typical values ranging from $mV$ (into an oscilloscope) to $kV$ (power lines, severe arcing danger); $I$ is current, measured in Amperes ($A$), typical values ranging from $mA$ (relatively safe for bench-top work) to $A$ (very dangerous); $R$ is resistance, measured in Ohms ($\Omega$), typical values ranging from $\Omega$ (power resistors dissipating a lot of power) to $M\Omega$ (almost a no-connect). | ||

+ | |||

+ | \section*{Resistor} | ||

+ | |||

+ | \begin{figure} | ||

+ | \includegraphics[width=1in]{resistor.png} | ||

+ | \caption{Symbol for a resistor in schematics} | ||

+ | \end{figure} | ||

+ | |||

+ | \subsection*{Resistors in Series} | ||

+ | Resistors in series add: | ||

+ | |||

+ | \begin{figure} | ||

+ | \includegraphics[width=1in]{resistor_series.png} | ||

+ | \caption{Resistors in series} | ||

+ | \end{figure} | ||

+ | |||

+ | \begin{equation} | ||

+ | R = R_1 + R_2 + \dots | ||

+ | \end{equation} | ||

+ | |||

+ | \subsection*{Resistors in Parallel} | ||

+ | Resistors in parallel add reciprocally: | ||

+ | |||

+ | \begin{figure} | ||

+ | \includegraphics[width=1in]{resistor_parallel.png} | ||

+ | \caption{Resistors in parallel} | ||

+ | \end{figure} | ||

+ | |||

+ | \begin{equation} | ||

+ | R = \frac1{\frac1{R_1} + \frac1{R_2} + \dots} | ||

+ | \end{equation} | ||

</latex> | </latex> |

## Revision as of 12:12, 28 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

*Symbol for a resistor in schematics*

### Resistors in Series

Resistors in series add:

*Resistors in series*

### Resistors in Parallel

Resistors in parallel add reciprocally:

*Resistors in parallel*