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# But to put an ammeter across a circuit element or

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Unformatted text preview: closed circuit values for the terminal voltage and the current Mlowing through the circuit to obtain a value for the internal resistance of the "good" battery, . 5. Similarly, calculate the internal resistance of the "bad" battery. 6. Compare the values of the internal resistance by calculating a percent discrepancy. 7. What conservation laws are equivalent statements of the "junction" and "loop" rule? PHY 2141/2181 EXP # 4 5 8. APPENDICES Appendix A: How to Read the Color Coding on a Resistor First two bands of color give first two significant figures of resistance value Third band gives number of zeroes in multiplier Black multiplier = 1** Red = 100 Orange = 1000, etc. * Color Code Black 0 Brown 1 Red 2 Orange 3 Yellow 4 Green 5 Blue 6 Violet 7 Gray 8 White 9 Last band is usually gold or silver and is the accuracy which the manufacturer will guarantee the value Silver = 10% Gold = 5% E.G., A 10,000-ohm resistor guaranteed to 10% will be color-coded BROWN-BLACK-ORANGE-SILVER Appendix B: Practical Pointers To rephrase what might have been missed on the Mirst reading: A voltmeter is easy to use, as you leave the circuit elements intact and just connect it across the element whose voltage you are measuring. However, for an ammeter, you must insert the meter into the circuit by opening the circuit at some point. Thus, there is more "work" in using an ammeterâ€”and it is a nuisance in some real- life cases, as in cutting open a wire to install an ammeter in your car's charging system. You may insert a voltmeter into a circuit with no damage to the meter. But to put an ammeter across a circuit element (or worse, across a battery or power supply) usually spells the end of the meter if it is unfused, since the ammeter offers a low- resistance pa...
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