Electrostatics, lab Measurement instruments Explain how to use an ammeter and a
ID: 1836814 • Letter: E
Question
Electrostatics, lab Measurement instruments Explain how to use an ammeter and a voltmeter to measure electrical properties in a circuit: If you need to measure the current and voltage drop across a resistor simultaneously, what complications arise? Consider a resistor network of three resistors. Two are in parallel with each other and one is in series with the parallel arrangement.Neglect wire resistance. How many currents and voltages can you measure in this circuit when it is connected to a battery in series with the series arrangement of the resistors?Explanation / Answer
a) ammetere need to be used in serie where current needs to be calculated .voltmeter need to be used in parallel to points in which voltage diff need to be measured
b)
most multi-meters can measure both voltage and current but normally only one at a time.
Hence if you set the i-meter to measure voltage (and use the voltage inputs - high impedance). this will have to measure the voltage across the cell, hence it is effectively connected in parallel with the cell.
If you set the other to measure current (low impedance) then it must be connected in series with the cell.
-----------------| Cell |------------ (amp meter)----
|--------(voltmeter)---|
Normally the multimeter will have a V (Voltage input), a I (Current input) and a Common.
When you select Voltage mode then connect the probes into V and Common. In this case the probes measure the voltage across the device you are trying to measure
When you select Current mode then you connect probes into I and Common. In this case the probes measure the current flowing through the device you are trying to measure and must be placed in series. It normally has a fuse as well in case the current gets too high.
c)Voltage can be measure across resistors in parallel and resisot which is in series.
Current can be measured along all the resistors and total current
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.