2-Draw an electric circuit with a DC power supply unit Add a voltmeter in parall

Question

2-Draw an electric circuit with a DC power supply unit Add a voltmeter in parallel across the resistor (i point) supply unit, a resistor R, a switch and an ammeter 2.1- Explain why a voltmeter should have a high internal resi a small resistance to electrical current (2 points) an ammeter should have 2.2- We increase the electric power gradually and record the voltage trials in the following table record the voltage and current values for 5 Trial 2 4 Voltage (V 2.0 2.5 3.0 3.5 4.0 Current (mA) R 75 102 122 138 161 Calculate the respective values of the resistor R (1 point) 2.3-Assume V = 0.05 V and | = 1 mA, calculate R/R and R and insert them in the provided table above. Calculate the average AR (3 points)

Explanation / Answer

I can answer only 2.1 without carrying out the experiment.

2.1 A voltmeter has to measure a tension, that is has to be parallel connected. In order not to alter the circuit properties its resistance must be as high as possible since it contribuition is 1/R

In the same way the ammeter measures a current in a serial connetction. Its internal resistence must be as low as possible in order not to "steal" tension to the circuit.

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