resistance relationships ohm’s lawand resistance（欧姆的电阻关系lawand阻力）.doc

Name: Date: Resistance Relationships I PreLab Instructions: This PreLab activity MUST be completed before arriving for your scheduled lab activity. No time will be given during lab to complete this exercise. PreLabs must be turned in upon arrival in lab; late submissions will not be accepted. Each PreLab is part of the laboratory and will be scored accordingly. Please circle the letter of the best response for each question. Consider the metaphor “electrical circuit as a system of pipes through which water is pumped.” In this system of pump and pipes, which of the following corresponds to voltage? Water Rate of water flow Pipe Pump Water pressure In the above metaphor, which of the following corresponds to current? Water Rate of water flow Pipe Pump Water pressure Which of the following sets of resistors are wired in series? Circle all correct responses. a. b. Which of the following circuits is properly wired for measuring the indicated variable (A = ammeter, V = voltmeter)? Circle all correct responses. a. b. Resistance Relationships Lab Objectives: At the conclusion of this lab activity, the student should be able to clearly and accurately: state the value of a resistor by interpreting the colored bands. state the relationship between voltage, current, and resistance in a simple circuit. state which readily observed factors influence the total resistance of an object, including how changes in these factors affect the total resistance. Task I. Determine the relationship between voltage and current in a simple circuit. a. Using a power supply, meters, wires, and a resistor, find the relationship between voltage (measured in volts, V) and current (I, measured in amperes, A) in a circuit containing a single resistor. Q1. What is the indicated resistance of the resistor element including the tolerance range? Use the provided guide as necessary. Be certain to include units (?). Note that this is one of the parameters of your elect