## Two-readings method for resistance measurement: First the drop in voltage across a known resistor is measured and then across the unknown resistor

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On: 18 Jun, 2017

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Figure 3.1. It consists of placing a known stable resistor in series with the unknown one. First a reading is taken across that resistor and then another reading across the unknown one. Afterward the quotient between both readings is calculated.

Vs= V/(Rs+Rx ) Rs

The second one gives

Vx = V/(Rs+Rx) Rx

From the quotient between both readings R can be calculated as Rx = Rs Vx/Vs

If R and R are similar in value, the voltmeter error in both readings will be similar and will cancel when taking the quotient. The need for two readings inherent to this method makes it unsuitable for sensor measurement because of the inconvenience of the needed switching when the measurement must be fast. Also when the output signal must be in electrical form, it is not possible to make the quotient by hand.

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Circuit Diagram for AutomotiveCar Voltage Indicator

This circuit diagram shows detail schematic design of Automotive|Car Voltage Indicator. Simply connects this circuit to the battery of your vehicle, you will always know at a glance the approximate voltage available. This circuit diagram consists of following parts: Resistors, LED, Diode, Zener Diode, and Transistors. An indication of battery voltage is useful to the motorist for monitoring the battery’s capacity to deliver current, and as a check on the efficiency of the dynamo or alternator.

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To test the AC regulator voltage on Honda XR650R, perform the followings:

Chrysler Force Voltage Regulator Wire Harness

A voltage regulator is an electrical regulator designed to automatically maintain a constant voltage level. Depending on the design, it may be used to regulate one or more AC or DC voltages. Below picture shows a Chrysler | Force Voltage Regulator Wire Harness. This device has a force engines with 16 amp – 20 amp and charging system model years 1993 – present.

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