# Difference between revisions of "Ohm's Law"

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\begin{equation} | \begin{equation} | ||

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

\end{equation} | \end{equation} | ||

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\begin{equation} | \begin{equation} | ||

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

\end{equation} | \end{equation} | ||

</latex> | </latex> |

## Revision as of 12:56, 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

*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:

*Resistors in series*

### Resistors in Parallel

Resistors in parallel add reciprocally:

*Resistors in parallel*