Exercise 3 - Three Resistors Connected in Parallel to a DC Power Supply For this
ID: 1410561 • Letter: E
Question
Exercise 3 - Three Resistors Connected in Parallel to a DC Power Supply For this exercise, we will use the three resistors in the previous exercise and connected them in parallel as show in Figure 4. The resistance of the three resistors are R1 = 188 Ohm, R2 = 267 Ohm and R3 = 375 Ohm, The object is to find the equivalent resistance of the three resistors. The total voltage V_T = 4.6 V is the same as the last exercise. (For the lab you will need to measure this value.) We start by measuring the current I_T. Click on the link for the total current and enter the value below. Total Current = 54.0 mA What is the voltage across each of the three resistors? (The resistors are in parallel.) Voltage across R_1 = Voltage across R_2 = Voltage across R_3 = What is the current flow through each of the three resistors? Use Ohm's law to find the current. Current through R_1(188 Ohm) = Current through R_2 (267 Ohm) = Current through R_3 (375 Ohm) =Explanation / Answer
Well, as the 3 resistors are in parallel, the Voltage is the same for the each one, so
V1=V2=V3=4.6 V
Using Ohm's Law, we find each current
I1= V1/R1= 4.6/188= 24.47mA
I2= V2/R2= 4.6/267= 17.23mA
I3= V3/R3= 4.6/375= 12.27mA
We know that our result of each current is correct because I1+I2+I3= It, hence
24.47 + 17.23+12.27= 54mA
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