The aim of the experiment
Experiment with the tools
Electric circuit board
Multimeter
A voltmeter
An ammeter
A power supply
resistance
Wires
Steps to conduct the experiment
Activity 1: Use Ohm’s law to verify the rules of series and parallel connections of
electric resistors and/or electric network.
Using the digital multimeter, measure the resistance of a three different resistors
R1, R2, and R3 and compare the measured to the standard values (report any
differences)
Use Equation 1 and equation 2 to find 𝑹𝒆𝒒 for parallel and series connections.
Use the breadboard (plug-in electric board) to construct the following electric
circuits where the resistors are connected in series as shown in the figure. Make
sure you connect the ammeter and voltameter in the correct places and with the
correct polarity
.
Now vary the value of the applied voltage from the power supply and record the
value of the voltage (V) and its corresponding current (I) value in Table 1.
Repeat the previous step by increasing the value of the applied voltage from the
power supply and list the value of I and V in Table 1.
Repeat the above procedures, but connecting the resistors in parallel as shown in
the figure bellow
Plot the data in Table 1 and Table 2 in a graphical paper with the current I on the
horizontal axis and the voltage on the vertical axis.
Make sure that Ohm’s law is satisfied (a straight-line plot is obtained)
Estimate the slope of the straight line which gives the equivalent resistance 𝑹𝒆𝒒
for parallel and series connections and compare it with that calculated from
Equation1 and equation 2.
Activity 2: Series connection and Kirchhoff’s voltage law (KVL) (one loop circuit)
Using the digital multimeter, measure the resistance of a three different resistors
R1, R2, and R3 and compare the measured to the standard values (report any
differences)
Use the breadboard (plug-in electric board) to construct the following electric
circuits where the resistors are connected in series as shown in the figure and
there will be one loop electric circuit.
Use multimeter to measure the potential difference between each resistor and
record the obtained value in the given Table. Make sure you connect the
voltameter with correct polarity.
Find the sum of all voltage in the loop, and test if KVL is satisfied.
Repeat the above steps for five values of the applied voltage.
Activity 3: Parallel connection and Kirchhoff’s current law (KCL) law.
Using the digital multimeter, measure the resistance of a three different resistors
R1, R2, and R3 and compare the measured to the standard values (report any
differences)
Use the breadboard (plug-in electric board) to construct the following electric
circuits where the resistors are connected in parallel as shown in the figure and
there will be one loop electric circuit.
Use multimeter to measure the current in each branch and record the obtained
value in the given Table.
Find the sum of all currents and compare it with the current in the main branch.
Assuming the current going to the node is positive and that coming out of the node
is negative, test if KCL is satisfied.
Repeat the above steps for five values of the main currents.
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