LAB REPORT #1
Student Name: Poyraz Emel
Lab Session: E
Date of Submission: 05.03.2021
The purpose of this experiment is to calculate the voltage and current passing through resistors
connected in parallel and in series. First, LtSpice was used to calculate the voltage across the resistor.
In the first experiment, it was observed that the voltage value passing over the resistor found using
Ltspice was the same as the voltage value we found. The formula V = Ir was used for this calculation.
In the experiment carried out in the second stage, three different values of resistors were selected
and a circuit was created with the Ltspice program. In this created circuit, R1 and R2 were connected
in parallel with each other, while R3 was connected to them in series. 2 Kohms as the value of R1
resistor, 4 Kohms as the value of R2 resistor, and finally 10 Kohms as the value of R3 resistor. AllAll
three resistors used in the circuit have error percentages. This error percentage is 1 for R1, 2 for R2
and 5 for R3. As a result of these error percentages, the actual values of the resistors changed. The
value of the resistance R1 was 2.02 Kohm, the value of R2 was 4.08 Kohm, and the value of R3 was
10.5 Kohm. In this experiment, DC source, ammeter, voltmeter, resistors, and cables are used to
reach the data we need. When the calculations are made, 2 Kohm and 4 Kohm resistors are
connected in parallel to each other, 10Kohm resistors are connected to them in a series. Using the
formula V = ir to calculate the current and voltage across resistors, the general current was
calculated. After the general current passing through the circuit, whose voltage was determined as
4V, was found to be 0.35 mA, the current released from the circuit was divided into 2 so that it would
pass 0.233mA through the 2K ohm resistor and 0.116mA through the 4Kohm resistor. Then, the
currents passing through R1 and R2 combined and passed through R3 as 0.35mA. Since the current
passing through the 2K ohm resistor was calculated as 0.233 mA, the voltage passing over it was
calculated as 0.466V by using the formula V = ir to calculate the voltage passing over it. What's more,
since the voltage values passing through the resistors connected parallel to each other are the same,
0.466V voltage passes over the 4Kohm. Since 0.35mA passes through the 10Kohm resistor, the
voltage on R3 was found to be 3.5V.
Consequently, as observed in the experiments, equal voltage passes through the resistors connected
in parallel. The difference in resistance values affects this situation, because each resistor has a
current inversely proportional to its value, because of the V = ir formula, the voltages passing over
them are the same. What's more, it has been observed that the margin of error percentages we have
created on the resistors in the experiments carried out slightly change the current and voltage
passing through the circuit.
POST-LAB ASSIGMENT
1) The voltmeter must be connected in parallel with the resistance because the purpose of the
voltmeter is to measure the voltage difference between the two points. If it is connected in a series,
the value it will measure will be "0".This voltmeter has high resistance, so less current flows through
the voltmeter. So, the effect on the circuit is so small it can also be ignored.
2) Ammeter must be connected in a series with resistors. Because the resistance of the ammeter is
very low, if the ammeter is connected in parallel to the circuit, the current will pass through the
ammeter and cause a short circuit. Low voltage drops across the ammeter, because ammeter has
very low resistance.
3)Voltage divider: The purpose of the "Voltage Divider" is to divide the voltage in the general circuit
into the circuit elements that the circuit needs. There are some limitations, which are not wild.
MeasurementThe measurement is only as accurate as the component used for the partial pressure,
which brings its own uncertainty.It is possible that the power consumption of the system is reduced
by dividing the voltage by the random resistance.
