A 100mv, 5mA d’Arsonval movement is to be used in an ammeter whose full-scale reading is 1A. Calculate RA.(a) 0.7 ohms(b) 0.5 ohms(c) 0.1 ohms(d) 0.2 ohmsI had been asked this question by my college director while I was bunking the class.This intriguing question comes from Measuring Voltage and Current in section Simple Resistive Circuits of Electric Circuits

A 100mv, 5mA d’Arsonval movement is to be used in an ammeter whose f

1.	A 100mv, 5mA d’Arsonval movement is to be used in an ammeter whose full-scale reading is 1A. Calculate RA.(a) 0.7 ohms(b) 0.5 ohms(c) 0.1 ohms(d) 0.2 ohmsI had been asked this question by my college director while I was bunking the class.This intriguing question comes from Measuring Voltage and Current in section Simple Resistive Circuits of Electric Circuits
Answer» Right CHOICE is (c) 0.1 ohms The explanation is: 5MA is flowing through the COIL which IMPLIES 995mA are diverted through RA. V = iR = 100 * 10^-3 = 995 * 10^-3 RA RA= 0.100Ω.

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