Electronics & Software – Tips & Guide


When does the open resistor read an infinite value in an ohmmeter?

When does the open resistor read an infinite value in an ohmmeter?

If the resistor is really open, it will measure infinity when you check it with an ohmmeter. in my work of repairing televisions, for example, if we have a resistance supposed to be 47 kohms and that the measurements indicate 10 megohms, I would call it open because, as for the circuit, it was open because it prevented the circuit to work properly or at all.

1.If the resistors are connected in series, no current will flow due to the infinite resistance (open circuit). if the resistors are connected in parallel, the current will flow

2. the infinite resistance is an open circuit (resistance burned in real life), no current will circulate, zero ohms being a short circuit. in simple terms, infinite resistance means that there is no resistance.

If you short the probes, you have a short circuit, there is no resistance and the ohmmeter reads 0 ohms.

If you do not connect the probes to anything, you have an open circuit, there is no path from one to the other (except by air), and the meter will read to the infinite ohms.

I’m not quite sure of the term open resistance, it’s not the one I know and I’ve never seen it used with switches and transistor collectors. However, I will have a little discussion on ohmmeters.

Built-in resistance meters on multimeters will show you infinity when you measure something out of their range. I have a small counter that is 200k and a big one that is 100m. nothing greater than that (like a gap) that he can not measure. it’s when it shows me the infinite. I know then that the resistance considered is higher than that of the top of the range.

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