Hi,

I had the "Measurements and Error" experiment last week.
One of the parts of the experiment was to take 10 readings of the RMS voltage using a Voltmeter.
The problem is, my readings of the RMS voltage were decreasing by time, however, the teacher said that they're suppose to be increasing because the system is heating up due to resistivity.

Can someone explain why readings were decreasing?

Thanks a lot!
​

 

Readings could have been decreasing, increasing or steady.
The devil is in the details.
It depends on the circuit diagram and what you were measuring.

 

The connection consisted of the function generator and the oscilloscope only.

 

Readings could have been decreasing, increasing or steady.
The devil is in the details.
It depends on the circuit diagram and what you were measuring.

The circuit consisted of function generator and oscilloscope only. They were connected together through wires, and we had to check if the actual voltage in the wires is equal to the volt displayed on the oscilloscope screen using a Voltmeter. Why were my readings of the volt decreasing?​

 

Details, details, details.

What is the make and model number of the function generator, oscilloscope and meter.
What was the setting of the function generator, frequency, voltage, waveform?
What type of cables was used to make the connections?
What were your 10 readings on the oscilloscope and the meter?
What is the time interval between readings?