PHYSICS 1404 Lab Homework - CircuitsI This homework wil be due when you come to
ID: 1730459 • Letter: P
Question
PHYSICS 1404 Lab Homework - CircuitsI This homework wil be due when you come to lab July 23 and 24. A student has begun building a multimeter in the lab and then leaves for lunch. The multimeter has three settings, OFF, VOLTAGE, and CURRENT. Whether the multimeter functions as an ammeter or a voltmeter is determined by the internal resistance (high or low) of a particular setting. The first student forgot to label the settings before he left. The display gives a number without units. The components of the multimeter are not encased, and the user can see whether the internal resistance is high or low. A second student comes into the lab and uses the multimeter. He wishes to measure the current through a bulb and the voltage across a bulb when the bulb is connected to a battery. The only information he has about what setting the multimeter is on is from the resistors. Explain how he will determine which setting is for voltage and which is for current.Explanation / Answer
1. Determination for Voltage Setting
The multimeter will function as a voltmeter if the internal resistance of the resistor is LOW. Since the accuracy of the voltmeter will depend upon how much voltage drop will occur across the meter movement, that is why the internal resistance of the voltmeter is kept low.
2. Determination for Current Setting
The multimeter will operate as an ammeter if the internal resistance of the resistor is HIGH. Since the accuracy of the ammeter is dependent upon how much current passes through the meter movement, so across the meter movement a very high internal resistance is connected in parallel across it.
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