Act_13 - Name _ Section _ Period 13 Activity Sheet:...

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49 Name ___________________________ Section ______________________ Period 13 Activity Sheet: Electrical Resistance and Joule Heating Activity 13.1: What Does the Electrical Resistance of a Wire Depend Upon? a) Resistor length, L Use a multimeter to measure the resistance of the wires on the green board. 1) Measure the resistance of the thin 30 cm nichrome wire. _________ 2) Measure the resistance of the 15 cm nichrome wire of the same thickness. ____________ 3) Does resistance R increase or decrease with increasing length L ? ________________ b) Resistor thickness, A 1) Using a multimeter, measure the resistance of the thick 30 cm wire. _____________ 2) Does resistance R increase or decrease with increasing cross-sectional area A ? _______ c) Resistivity: The resistance of wires also depends upon the resistivity ( ρ ), of the wire material. Use connecting wires to connect a 3-battery tray, a one-bulb tray, and a piece of copper in series. Note the brightness of the bulb. Then replace the copper with other materials and note the brightness of the bulb. Indicate which materials have high resistance, intermediate resistance, and low resistance. Material Bulb brightness Resistance a) Copper b) Plastic c) Graphite d) Glass e) Iron d) Relationship between R, L, A , and r We have found that the resistance of a wire,
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Act_13 - Name _ Section _ Period 13 Activity Sheet:...

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