SCEN103 Class 13

Circuit Analysis Quiz

Resistivity and Play-Doh

Voltmeters and Ammeters

	An ammeter measures current through a circuit element; -- therefore it must be connected in series with it. An ammeter should have a much lower resistance than the other elements in the circuit; -- otherwise current may change significantly. Consider effective resistance.
	A voltmeter measures voltage across a circuit element; -- therefore it must be connected in parallel with it. A voltmeter should have a much higher resistance than the element in parallel; -- otherwise voltage will change significantly. Again, consider effective resistance.

Resistance of a cylinder

Review of circuit used for experiment Dependence on length? Demonstration using Play-Doh Results: Graph Conclusion: Resistance is ??? to the length of a cylindrical resistor. Dependence on diameter? Group Activity Procedure Data: collected by groups from previous term Graph: R vs. Diameter Graph: R vs. Reciprocal Diameter Graph: R vs. Reciprocal Area Conclusion: Resistance is ??? to the cross-sectional area of a cylindrical resistor. The Result!