By Tony R. Kuphaldt
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Extra info for Experiments
You are now assured of measuring current through the wire or terminal initially identified. 4. AMMETER USAGE 39 m V wire pulled out of breadboard A A V OFF + A COM spare wire Again, measure current through different wires in this circuit, following the same connection procedure outlined above. What do you notice about these current measurements? The results in the breadboard circuit should be the same as the results in the free-form (no breadboard) circuit. Building the same circuit on a terminal strip should also yield similar results: 40 CHAPTER 2.
Voltage should remain approximately the same for any resistor size inserted into the circuit, because it is the nature of a battery to maintain voltage at a constant level. 44 CHAPTER 2. 6 Nonlinear resistance PARTS AND MATERIALS • Calculator (or pencil and paper for doing arithmetic) • 6-volt battery • Low-voltage incandescent lamp (Radio Shack catalog # 272-1130 or equivalent) CROSS-REFERENCES Lessons In Electric Circuits, Volume 1, chapter 2: ”Ohm’s Law” LEARNING OBJECTIVES • Voltmeter use • Ammeter use • Ohmmeter use • Use of Ohm’s Law • Realization that some resistances are unstable!
Voltage measured between any point on the upper wire and any point on the lower wire should be the same. Voltage measured between any two common points, however, should be zero. Using an ammeter, measure current through the circuit. Again, there is no one ”correct” way to measure current, so long as the ammeter is placed within the flow-path of electrons through the resistor and not across a source of voltage. To do this, make a break in the circuit, and place the ammeter within that break: connect the two test probes to the two wire or terminal ends left open from the break.