Unformatted text preview: the voltmeter if it is set up in parallel, allowing the rest to flow through the actual resistor. On the other hand, if the voltmeter were added in series, the total circuit resistance would be significantly affected. 4. When used as an ohmmeter, a Fluke 77 meter gives a reading of 571.5 ohm for a resistor that has a nominal resistance of 560 ohm +/- 5%. What resistance value and uncertainty should be reported for this resistor? The resistance value of 571.5 ohm falls within the nominal resistances uncertainty of 5%. Therefore, the resistance can be reported as 560 ohm +/- 5%. 5. Is current used up in a circuit? What about voltage? Explain. According to the loop rule, the net change in electric potential must be zero around any loop. Therefore, voltage is not used up in a circuit. Using the Ohms Law (V=IR), if voltage is constant and resistance increases, current decreases or is used up....
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- Fall '08
- Resistor, Electrical resistance, Voltmeters, Ammeters