Difference between revisions of "Ohm's Law"
Line 40: | Line 40: | ||
\begin{equation} | \begin{equation} | ||
− | R = R_1 + R_2 + \dots | + | R = R_1 + R_2 + \dots + R_n |
\end{equation} | \end{equation} | ||
Line 52: | Line 52: | ||
\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