Difference between revisions of "Electronics written problems"
(→Measuring action potentials) |
|||
Line 96: | Line 96: | ||
==Measuring action potentials== | ==Measuring action potentials== | ||
The [https://en.wikipedia.org/wiki/Patch_clamp patch clamp] is a technique for measuring voltages produced by electrically active cells such as neurons. A circuit model for a neuron connected to a patch clamp apparatus consists of a time-varying voltage source in series with an output impedance of 10<sup>11</sup> Ω. There is an oscilloscope next to the neuron with an ''input impedance'' of 10<sup>6</sup> Ω and an input capacitance of 20 pFd. A new UROP in the lab attempts to measure the electrical spikes produced by the neuron (called ''action potentials'') by connecting a patch-clamped neuron to the oscilloscope with a cable that has a capacitance of 80 pFd. The oscilloscope has a noise floor of 10<sup>-3</sup> V. | The [https://en.wikipedia.org/wiki/Patch_clamp patch clamp] is a technique for measuring voltages produced by electrically active cells such as neurons. A circuit model for a neuron connected to a patch clamp apparatus consists of a time-varying voltage source in series with an output impedance of 10<sup>11</sup> Ω. There is an oscilloscope next to the neuron with an ''input impedance'' of 10<sup>6</sup> Ω and an input capacitance of 20 pFd. A new UROP in the lab attempts to measure the electrical spikes produced by the neuron (called ''action potentials'') by connecting a patch-clamped neuron to the oscilloscope with a cable that has a capacitance of 80 pFd. The oscilloscope has a noise floor of 10<sup>-3</sup> V. | ||
− | File:Patch clamp circuit model.png|750px]] | + | [[File:Patch clamp circuit model.png|750px]] |
{{Template:Assignment Turn In|message= | {{Template:Assignment Turn In|message= |
Revision as of 19:48, 18 October 2018
This is Part 2 of Assignment 6.
Ideal elements
Resistive circuits
For each of the circuits below, find the voltage at each node and the current through each element. |
1 | 2 | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
3 | |||||||||||||||||
Equivalent circuits
Easy Bode plots
Harder Bode plots
Linear systems
Measuring action potentialsThe patch clamp is a technique for measuring voltages produced by electrically active cells such as neurons. A circuit model for a neuron connected to a patch clamp apparatus consists of a time-varying voltage source in series with an output impedance of 1011 Ω. There is an oscilloscope next to the neuron with an input impedance of 106 Ω and an input capacitance of 20 pFd. A new UROP in the lab attempts to measure the electrical spikes produced by the neuron (called action potentials) by connecting a patch-clamped neuron to the oscilloscope with a cable that has a capacitance of 80 pFd. The oscilloscope has a noise floor of 10-3 V.
|