PHY 216 Lab #12 Purpose and IntroductionIn order to produce an electric current in a circuit, an electric potential difference needs to beproduced and one method of producing an electric potential difference is with the use of a battery . Theamount of flow of an electric current through a conductor, or a wire in this case, depends on the voltageand the resistance. The resistance is the resistance of the conducting material (wire) to the flow of theelectrons through it. The higher the resistance of the wire, the less the current for the electric potentialdifference or voltage . The relationship of current to resistance is inversely proportional, meaning that
the higher the resistance the lower the current for the given potential difference, or voltage. This is shownby this formula below:I=VR(1) In this equation R is the resistance of the wire or other conducting material given in ohms (Ω), Vis the potential difference across the wire given in volts (V), and I is the current that is flowing through itgiven in amperes or amps (A). The formula for Ohm’s Law is established when this equation isrearranged. Ohm developed the following formula to describe the interaction between voltage, current,and resistance:V=I∗R(2) Experimental DetailsThis experiment was conducted using three different types of resistors( decade box, carbon resistor, and light bulb). The decade box was set to a value of 300 and was recorded on the data sheet. The group noted that not all of the dials should be set to zero. Diagram 1shows the setup of the power supply, voltmeter, and ammeter. The voltmeter was put in voltmeter mode and the ammeter was put in ammeter mode and everything is measured in (mA). The power supply remained off until the instructor confirmed that everything was set up correctly. The power supply was turned on and the output voltage was adjusted in steps of 1 until the maximum of 10.0 V was reached. All data was recorded on the data sheet on table 1. The same increase in 1 until 10.0 V was reached was repeated using the carbon resistor in replacement of the decade box. A reading of 200 mA was not to be exceeded in this experiment.