Question

Prelab Name Class Section 1) if a 3.0 V battery is connected in series to a resistor with resistance R and a galvanometer whose full scale range is 1 mA, what is the minimum resistance R needed to avoid damaging the galvanometer? Show your calculations to get credit. 2) should an ammeter be connected in series or in parallel? Explain why. 3) should its internal resistance be high or low? Explain why. 4) should a voltmeter be connected in series or in parallel? Explain why. 5) should its internal resistance be high or low? Explain why.

Answer 1

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3 v RIG (resistance of galvanometer which is por-ideally reso) .. 1 = la = 1x13 - 3 . RTG Bixio3 = 3000 R=(3000-G) (Pmin = 30000 for ao (ideal case) R+G= 3 2 Ammeter should be connected in "Series" with external circuit because it needs to measure Current using this device 3) for Ammeter's Internal resistance is "very low" . So that it does not affect the overall resistance of the Circuit is connected in "Parallell, this is a So must be Connected across 4) Voltmeter Voltage measuring device. the circuit in parallel 5) "Very High Internal resistance" because it has to drop max. Current New pally