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E10_2-22-10

E10_2-22-10 - E10 Ohms Law Materials Resistors ammeter...

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E10: Ohm’s “Law” Materials: Resistors, ammeter, voltmeter, power supply, wires, switch Initial definitions and givens: Resistance: the resistance of part of a circuit is defined to be the ratio of the voltage across it divided by the current flowing through it. R (ohms) = V (volts)/I (amperes) This is not Ohm’s “law”, it a definition A resistor is said to “obey Ohm’s law” if R doesn’t change when V is changed. Resistor: a circuit part with a well-defined resistance. Initial Instructions and questions: 1. Make a circuit with the power supply, ammeter, switch, and one of the resistors in series. Place the voltmeter in parallel with the resistor to measure the voltage between its two ends. Vary the output of the power supply so that the voltage across the resistor reads 1, 2, 3, 4, and 6 volts. Record the current through the resistor at each setting. Enter the data in GA and plot. (Careful: Should the voltage or current be the independent variable to be plotted on the x-axis?)

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