Resistors & Ohm’s Law
In this lab, students were introduced to the field of electrical engineering. The objectives of the lab were to determine the resistance of a resistor using various methods and to also verify Ohm’s Law. In the lab, the students were instructed to calculate the resistance by using color codes, measuring the resistance using a Digital Multi Meter, calculate the average resistance from 10 voltage and current measurements, and find the graphical resistance using a trend line. The results show that the average resistance calculated from 10 voltage and current readings and the graphical resistance were closest to the measured resistance, while the color coding resistance was furthest off. Introduction:
Georg Simon Ohm established that current (I) in a wire is proportional to the voltage (V) applied to its ends. How much current flows in the wire depends on the voltage but also on the resistance (R) of the wire. A higher resistance yields a lower current for a given voltage. (I= V/R) This is known as Ohm’s Law, where V is measured in volts, I is measured in amperes, and R is measured in ohms. Electrical engineers have to build devices that control the flow of electrons. Changing the shape or choosing different materials with different resistance are ways that they do this. A resistor is a passive electronic component that goes against the electric current. Passive components do not require a power source in order to perform. In this lab, we measured the resistance of a passive resistor. Pictured below are examples of a simple resistor and an a simple circuit that shows how Ohm’s Law works.
First, the group had to record the manufacturer, part number and serial number of the Direct Current (DC) power supply and of the Digital Multi Meter (DMM).
They are as follows:
| Part Number
| Serial Number
Then, a resistor was...
References: 1. 111 Electrical Laboratory Session Electrical Topic: Resistors & Ohm’s Law Handout from Dr. Robert Samuel
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