Thinking About an Ammeter and a Voltmeter An ammeter is an instrument that shows

Question

Thinking About an Ammeter and a Voltmeter
An ammeter is an instrument that shows how much current passes through it. It is designed to have a small resistance. The following problems show why.

A. Suppose an ammeter having a resistance of 0.5? is connected in parallel across a resistor of 50.0? as shown in the figure.

1. If the system is connected up to a 12 V battery, how much current would pass through the ammeter? (Assume you can ignore the internal resistance of the battery.)
2. How much current would pass through the 50? resistor? Is this ammeter giving a good measure of the current in the 50? resistor? Explain why or why not.
3. Is this ammeter giving a good measurement of what the current would be in the resistor if the ammeter weren't there?

Explanation / Answer

1)If the system is connected up to a 12 V battery, how much current would pass through the ammeter? (Assume you can ignore the internal resistance of the battery.) total r =50*0.5/50.5=0.495ohm i=12/0.495 current through ammeter=12/0.495 *50/50.5=24ampere 2)How much current would pass through the 50O resistor? Is this ammeter giving a good measure of the current in the 50O resistor? Explain why or why not. =12/0.495 *0.5/50.5 =0.24ampere yes it is a good measure.

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