216 Experiment: The Galvanometer Part 1: Galvanometer Exercise Galvanometer need

Question

216 Experiment: The Galvanometer Part 1: Galvanometer Exercise Galvanometer needles rotate more when more current passes through the galvanometer When the galvanometer mechanism is co built into an ammeter (for current) it's placed in parallel with another resister used to set the sensitivity of the ammeter. Often there is a switch or dial that allows the user to select a parallel resistor and thus select the sensitivity of the ammeter. The question is: If the parallel resistor becomes larger, does the a become more or less sensitive? To explore this question, examine the three following circuit diagrams and use the for resistors in series and parallel to fill in the missing values. When this i in completed, you should know how much current will be passing through the galvanometer each configuration. The galvanometer current will determine how far the needle will turn. Answer these questions: (Circle the best answer) 1. In which configuration is the ammeter the most sensitive? 2. If the parallel resistor becomes larger, does less the ammeter become more or less sensitive? Configuration #1: Ammeter R o A 1.00 S2 R, 1.00 S2 1.002 2.00 2 R, 1.00 3.00 2 1.00 V Lab Instructor S. TRandaly

Explanation / Answer

1) Most sensitive in configuration 3.

2) Ammeter becomes more sensitive.

When the shunt resistance becomes larger, less current will flow in the shunt and more in the galvanometer coil. This makes the ammeter more sensitive with increasing shunt resistance.

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