Per13_over - Preview of Period 13: Electrical Resistance...

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Unformatted text preview: Preview of Period 13: Electrical Resistance and Joule Heating 13.1 Electrical Resistance of a Wire What does the resistance of a wire depend upon? 13.2 Resistance and Joule Heating What effect does resistance have on current flow? What is joule heating? 13.3 Temperature and Resistance How does the temperature of a wire affect its resistance? 13-1 Measuring Resistance with a Multimeter 1. Turn the dial to the ohm symbol ( ). 2. Check that the wire leads are attached to the outlets on the lower right of the meter. 3. To measure resistance, touch the ends of the leads to each end of the resistor wire. . 13-2 V COM Act. 13.1: Measuring Resistance 1. Do not connect the battery tray to the green board with resistance wires. 2. Set the multimeter to to measure resistance. 3. Touch the ends of the multimeter leads across the thin 30 cm wire to measure its resistance. Then move the multimeter leads to the ends of the 15 cm wire to measure its resistance. 13-3 Measuring the resistance of the 30 cm wire. Act.13.1: Resistance of a Wire Resistance of a wire = Resistivity x Length Area A L R = R = resistance (in ohms) = resistivity (in ohm meters) L = length of resistor (in meters) A = cross-sectional area (in meters 2 ) 13-4 A L A Wire Resistor of Length L and Cross-Sectional Area A Joule Heating in Wires...
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Per13_over - Preview of Period 13: Electrical Resistance...

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