Simple ohmmeter circuit

The circuit has a linear reading scale, does not need to be calibrated, and does not need to be zeroed. By switching different standard resistors through the switch, it can be made into an ohmmeter with a K range (the ohmmeter is a meter for measuring resistance, and the diagram is a measurement schematic of an ohmmeter). G is an ammeter with an internal resistance of Rg and a full-scale current of Ig, R is a variable resistor, also called a zero-resistance; the battery is a dry battery, the electromotive force is E, the internal resistance is r, and the red test pen (insert "+" The jack is connected to the negative pole of the battery; the black test lead (inserted into the “-” jack) is connected to the positive pole of the battery. When the measured resistance Rxr is small compared to Rg and R, it can be ignored.

Ohm table circuit diagram

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