A resistance R is measured using the connection shown in the below figure.The current measured is 10 A on ranges 100A and the voltage measured is 125 V on 150 V range. The scales of the ammeter and voltmeter are uniform. The total number of scale divisions of the ammeter is 100 and that of the voltmeter is 150. The scale division can be distinguished. The constructional error of the ammeter is ± 0.3% and that of voltmeter±0.4%. The resistance of the ammeter is 0.25 Ω.The value of R is?

Measurement of Resistance topics include: Bridges basics, bridge circuits advantages, wheatstone bridge balance condition and sensitivity, wheatstone bridge applications, limitations and measurement errors, kelvin bridge, earth resistance measurement, merger and its applications, advanced problems on medium and high measurement, resistance measurement and electrical instruments problems. Some ways to measure resistance are: Ohm's Law: A basic method for measuring resistance that uses a digital ammeter and voltmeter. The method assumes that repeated measurements will give identical readings... Show more

Measurement of Resistance topics include: Bridges basics, bridge circuits advantages, wheatstone bridge balance condition and sensitivity, wheatstone bridge applications, limitations and measurement errors, kelvin bridge, earth resistance measurement, merger and its applications, advanced problems on medium and high measurement, resistance measurement and electrical instruments problems.

Some ways to measure resistance are:
Ohm's Law: A basic method for measuring resistance that uses a digital ammeter and voltmeter. The method assumes that repeated measurements will give identical readings of voltage and current.
Wheatstone bridge: A common method that uses four resistances, one of which is unknown, and the other three are known.
Digital multimeter: Measures resistance by applying a small voltage and measuring the current. However, it can only measure relatively low resistances.
Voltmeter: Used to measure resistance by setting the probes to the same distance on each sample.
Ammeter: A DC ammeter can be used to measure resistance by placing a known value of DC voltage (battery).
Potentiometer: A device that measures the resistance between two points. It usually consists of a rotating shaft and a threaded shaft that passes through it.
Continuity testing: Measures the resistance between two points in ohms. Low resistance means that the circuit is closed and there is electrical continuity. High resistance means that the circuit is open, and continuity is lacking.
Four-wire measurement method: A resistance measurement for very small resistance values (< 0.1 Ohm). This method is predominantly used for HDI multilayers, e.g. to detect copper defects in Micro-Vias.

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