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LAB REPORT 2: Introduction to Multisim

By: Youming Guan

09/15/2016

EMT 1150- Electrical Circuit Laboratory

Professor Michael Levy

Abstract Long before humans understood electricity, we can only rely on natural sources of light such as the moon or candles to brighten our nights. But in 1879, that changed due to Thomas Edison’s invention of the light bulb. We are told to use Multisim to create a circuit that may be used in the lighting of a bulb. I will be using the equation V=I*R to calculate the values of each aspect of the circuit. In the design, I am asking how I can calculate the voltage if I were to use the formula V=I*R. In the discussion I will be asking, why did the value of the voltage in my first attempt fail to add up to the 15V? The voltage of the battery was given to the circuit from the get go, but I did not have a multimeter set up at each individual resistor. In conclusion, after using a multimeter on each individual resistor I put into the circuit, I created a working circuit using a 15V battery. Introduction Long before humans understood electricity, we can only rely on natural sources of light such as the moon or candles to brighten our nights. But in 1879, that changed due to Thomas Edison’s invention of the light bulb. We are told to use Multisim to create a circuit that may be used in the lighting of a bulb. We were told to use the different components from the simulation to power it from the lab (see fig.1). Then we are told to create our own circuit consisting of three resistors of any value, and also to use a battery of 15V. Background Theory In this section of the lab report, I will be stating the equation to be used in the future to be V=I*R. Design In the design, I am asking how I can calculate the voltage if I were to use the formula V=I*R. If the set voltage is 15V then I must use the values of the resistors to figure out the voltage, this means I must add all the values of the resistors and multiply it by the total percent and it must equate to 15V. Procedure -Use 1kohm resistor and select a 5% tolerance. (see fig.1) -Create a 200ohm resistor, SPST switch, DC_Power, Ground and multimeter.(see fig.1) -Using 15V battery, create a circuit using 3 resistors of any value and have it run successfully. (see fig. 3)

Fig. 1 Base circuit we were told to introduce us to the concept of the simulation.

Fig. 2 First attempt at the circuit, the amount of volts does not add up to 15V.

Fig.3 Actual finished product of the circuit with 15V, the three voltages on the multimeters adds up to 15V evenly.

Results I noticed at first that the voltages on the multimeters did not add up to 15V, which confused me at first (see fig. 2), but then I noticed that there was not enough multimeters for each individual resistor. After adding two more multi-meters the total voltage of the three numbers comes out to be an even 15V (see fig. 3). Discussion In the discussion I will be asking, why did the value of the voltage in my first attempt fail to add up to the 15V? The voltage of the battery was given to the circuit from the get go, but I did not have a multimeter set up at each individual resistor, therefore it did not show the values of each resistor and causing the voltage to not add to 15V (see figs 2+3.) Conclusion In conclusion, after using a multimeter on each individual resistor I put into the circuit, I

created a working circuit using a 15V battery....