Question

The experiment and data collection: A simple circuit was set up to explore the Ohm's law (see next page). The resistor R was a piece of high resistance wire. PS represents a DC (direct current) power supply, circled A and V represent an ammeter and a voltmeter. Notice that in the figure the ammeter is connected in series with the high resistance wire and the voltmeter is connected in parallel. The power supply allows the experimenter to adjust the voltage applied to the circuit. The following current and voltage values were measured in the experiment: I(A) 0.10 0.20 0.30 0.40 0.50 V(V) 0.56 1.1 1.6 2.1 2.6 Data analysis: Plot V vs. I (voltage across the wire in Volts vs. current in the wire in Amps). Plot V on the y-axis and I on the x-axis. Use a computer or a graphing calculator if you can. If you make a hand drawn graph, be sure to use a ruler. Label the axes on your graph. Indicate the units for each axis. Include the graph into your lab report. 1) According to the Ohm's law, the voltage across the resistor should depend linearly on the current in the resistor. Based on your graph, does the data collected in the experiment support the Ohm's law? 2) The slope of the V vs. I graph is the resistance of the wire. Based on your graph, what was the resistance of the wire in the experiment? 3) In the picture above, the ammeter is on the 'B' side of the power supply. The experimenter notices that the ammeter reads 0.30 A. Keeping the voltage applied to the circuit by the power supply unchanged, the experimenter moves the ammeter to the 'A' side of the power supply. What value for the current will the ammeter show at the new location? Defend your answer. 4) The experimenter then moves the ammeter to a point corresponding to point 'C' in the figure. What value for the current will the ammeter show at this new location? Defend your answer. 5) What is the difference between voltage and current?

The experiment and data collection:

A simple circuit was set up to explore the Ohm's law (see next page). The resistor R was a piece of high resistance wire. PS represents a DC (direct current) power supply, circled A and V represent an ammeter and a voltmeter. Notice that in the figure the ammeter is connected in series with the high resistance wire and the voltmeter is connected in parallel. The power supply allows the experimenter to adjust the voltage applied to the circuit.

The following current and voltage values were measured in the experiment:

I(A) 0.10 0.20 0.30 0.40 0.50
V(V) 0.56 1.1 1.6 2.1 2.6

Data analysis: Plot V vs. I (voltage across the wire in Volts vs. current in the wire in Amps). Plot V on the y-axis and I on the x-axis. Use a computer or a graphing calculator if you can. If you make a hand drawn graph, be sure to use a ruler.

Label the axes on your graph. Indicate the units for each axis. Include the graph into your lab report.

1) According to the Ohm's law, the voltage across the resistor should depend linearly on the current in the resistor. Based on your graph, does the data collected in the experiment support the Ohm's law?

2) The slope of the V vs. I graph is the resistance of the wire. Based on your graph, what was the resistance of the wire in the experiment?

3) In the picture above, the ammeter is on the 'B' side of the power supply. The experimenter notices that the ammeter reads 0.30 A. Keeping the voltage applied to the circuit by the power supply unchanged, the experimenter moves the ammeter to the 'A' side of the power supply. What value for the current will the ammeter show at the new location? Defend your answer.

4) The experimenter then moves the ammeter to a point corresponding to point 'C' in the figure. What value for the current will the ammeter show at this new location? Defend your answer.

5) What is the difference between voltage and current?

The experiment and data collection:

A simple circuit was set up to explore the Ohm's law (see next page). The resistor R was a piece of high resistance wire. PS represents a DC (direct current) power supply, circled A and V represent an ammeter and a voltmeter. Notice that in the figure the ammeter is connected in series with the high resistance wire and the voltmeter is connected in parallel. The power supply allows the experimenter to adjust the voltage applied to the circuit.

The following current and voltage values were measured in the experiment:

I(A) 0.10 0.20 0.30 0.40 0.50
V(V) 0.56 1.1 1.6 2.1 2.6

Data analysis: Plot V vs. I (voltage across the wire in Volts vs. current in the wire in Amps). Plot V on the y-axis and I on the x-axis. Use a computer or a graphing calculator if you can. If you make a hand drawn graph, be sure to use a ruler.

Label the axes on your graph. Indicate the units for each axis. Include the graph into your lab report.

1) According to the Ohm's law, the voltage across the resistor should depend linearly on the current in the resistor. Based on your graph, does the data collected in the experiment support the Ohm's law?

2) The slope of the V vs. I graph is the resistance of the wire. Based on your graph, what was the resistance of the wire in the experiment?

3) In the picture above, the ammeter is on the 'B' side of the power supply. The experimenter notices that the ammeter reads 0.30 A. Keeping the voltage applied to the circuit by the power supply unchanged, the experimenter moves the ammeter to the 'A' side of the power supply. What value for the current will the ammeter show at the new location? Defend your answer.

4) The experimenter then moves the ammeter to a point corresponding to point 'C' in the figure. What value for the current will the ammeter show at this new location? Defend your answer.

5) What is the difference between voltage and current?

Added by Anthony Y.

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