What is non-ohmic resistors? Give examples. What is galvanometer? How would you convert it into an ammeter?
Non-ohmic resistors are resistors that do not obey Ohm's law, meaning their resistance does not depend linearly on the applied voltage. Examples include thermistors, photoresistors, tunnel diodes, and field-effect transistors. A galvanometer is a device used to measure electric current. It can be converted into an ammeter by connecting a low resistance in series with the galvanometer. This resistance should be low enough that it does not significantly affect the current being measured, but...