LAB 7. RESISTIVITY

TESTING INVESTIGATION: RESISTIVITY OF PLAY-DOH

AP PHYSICS 1 and 2

Essential Knowledge 1.E.2: Matter has a property called resistivity.

a. The resistivity of a material depends on its molecular and atomic structure.

b. The resistivity depends on the temperature of the material.

• LO 1.E.2.1: The student is able to choose and justify the selection of data needed to determine resistivity for a given material. [SP 4.1]

Essential Knowledge 4.E.4: The resistance of a resistor, and the capacitance of a capacitor, can be understood from the basic properties of electric fields and forces, as well as the properties of materials and their geometry.

a. The resistance of a resistor is proportional to its length and inversely proportional to its cross-sectional area. The constant of proportionality is the resistivity of the material.

c. The current through a resistor is equal to the potential difference across the resistor divided by its resistance.

• LO 4.E.4.1:The student is able to make predictions about the properties of resistors when placed in a simple circuit, based on the geometry of the circuit element and supported by scientific theories and mathematical relationships. [SP 2.2, 6.4]
• LO 4.E.4.2: The student is able to design a plan for the collection of data to determine the effect of changing the geometry and/or materials on the resistance of a circuit element and relate results to the basic properties of resistors. [SP 4.1, 4.2]
• LO 4.E.4.3: The student is able to analyze data to determine the effect of changing the geometry and/or materials on the resistance of a circuit element and relate results to the basic properties of resistors. [SP 5.1]