# ENGR 2405 Lone Star College Ohms Law Values of Voltages Questions

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Subject
Engineering
School
Lone Star College
Type
Exam Practice
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Name; Lan Nguyen
Ohm's Law
OBJECTIVE: To demonstrate Ohm’s Law.
In Multisim measure the resistance between the terminals a dc voltmeter and a dc ammeter.
Resistor
R Ω
Vol-meter
Voltage(V) measured
in Volts (V)
Am-meter
Current (I) measured in
Amp (A)
Explain why the voltmeter have a greater resistance than the current meters.
Connect in Multisim the circuit shown in figure. Apply a voltage from 0 to 120 Volts DC and fill
the table with the values of voltages and currents.
30 Ω
+
𝑉
𝐴
𝑉

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Plot voltages Vs currents in the following graph and draw a line joints the points
30
30
30
30
30
30
30
30
30
0
15
30
45
60
75
90
105
120
0
0.5
1
1.5
2
2.5
3
3.5
4
30
30
30
30
30
30
30
30
Build and insert the circuit using Multisim and measure the values you need. Place your values in
the table below.

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Name; Lan Nguyen Ohm's Law OBJECTIVE: To demonstrate Ohm’s Law. In Multisim measure the resistance between the terminals a dc voltmeter and a dc ammeter. Resistor Vol-meter RΩ Voltage(V) measured in Volts (V) Current (I) measured in Amp (A) Am-meter Explain why the voltmeter have a greater resistance than the current meters. Connect in Multisim the circuit shown in figure. Apply a voltage from 0 to 120 Volts DC and fill the table with the values of voltages and currents. 𝐴 𝑉 + − 𝑉 30 Ω Build and insert the circuit using Multisim and measure the values you need. Place your values in the table below. R [Ω] Volts [V] Amp [A] V/A 30 0 0 30 15 0.5 30 30 30 1 30 30 45 1.5 30 30 60 2 30 30 75 2.5 30 30 90 3 30 30 105 3.5 30 Plot voltages Vs currents in the following graph and draw a line joints the points 30 120 4 30 What kind of plot did you get? The average ratio V/A is: 30 and the resistance that you used was: 30 Ω The equation is V = IR Now, adjust the source voltage to 120 V, change the resistance value according with the following table Volts [V] R [Ω] I [A] V/A 120 10 12 10 120 20 6 20 120 30 4 30 120 40 3 40 120 50 2.4 50 120 ...
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