Physics I, Lab Activity 22: Electrical Resistance & Play-Doh Purpose: To explore the various physical parameters which play a role in the electrical resistance of a wire. Documentation: This handout Theory: It turns out that the resistance of an object depends on what material it is made from and from its size and shape. Resistivity, p, is the measure of how resistant to the flow of charge a given material is; resistivity is the opposite of conductivity! Procedure: Use Play-Doh to create various 'wires' to test how their shape and size affect resistance. Connect a power supply, analog meters, and your resistor into a circuit. Please draw a schematic of your circuit in your lab notebook. Analysis: Determine how size and shape affect electrical resistance by measuring voltage across and current through the Play-Doh wire; calculate resistance using Ohm's law. Part 1: Short 'wire' versus long 'wire' of same diameter. Part I: Voltage (V) Current (A) Calculated Resistance () Short wire: Measurement #1 Vads 2.09 ( V) | 48.7 (AT Measurement #2 i Volts 3. 90 ( V) 135 ( M Al Long wire: Measurement #1 2 Volts 1.98 0V) | 26.5 ( MA Measurement #2 3. 95 ( ] 90 ( MA Part 2: Thin 'wire' versus thick 'wire' of same length. Part II: Voltage (V) Current (A) Calculated Resistance (2) Thin wire: Measurement #1 2 volty 25 MAT Measurement #2 3. 98 ( ) 50 WA Thick wire: Measurement #1 2- volts 1.1307 3 5MAT Measurement #2 3. 94 CUT 94.5 m AQuestions: (1) Draw a circuit diagram for your Play Doh circuit, including a voltmeter (the multimeter measuring voltage) and an ammeter (multimeter measuring current). Plaque wowor a Progres In bgede bod Quip (2) Compare your measurements in Part 1: How does the length of the wire impact its resistance? (A) thenoo (3) Compare your measurements in Part 2: How does the diameter of the wire impact its resistance