<a href="https://en.wikipedia.org/wiki/Voltage_clamp" class="extiw" title="en:Voltage clamp">Voltage clamp</a> diagram.
<a href="//commons.wikimedia.org/wiki/User:ShelleyAdams" title="User:ShelleyAdams">ShelleyAdams</a>
Own work based on: <a href="//commons.wikimedia.org/wiki/File:Voltage_clamp.jpg" title="File:Voltage clamp.jpg">Voltage clamp.jpg</a>