not certain about #5. plz help will thumbs up if right Suppose we have a resisto
ID: 1499509 • Letter: N
Question
not certain about #5. plz help will thumbs up if right
Suppose we have a resistor R1 = 10 ohm tied in series with a parallel combination of two resistors R2 = and R3 = 5 ohm. The battery supplies is 5 V. What is the current pass through R3? 0.125 A 0.2 A 0.25 A 0.375 A To point out the RC time constant t=RC, we use oscilloscope to display the plot of Voltage vs time of a discharge process. The initial Voltage is 8 V, at time 5s the voltage is 3.5s. What is the time constant t=RC 5s 6s 8.6 s 13.gsExplanation / Answer
5)
Net resistance of the circuit is R1+(R2*R3/(R2+R3)) = 10+((10*5)/(10+5)) = 13.33 ohm
current through R1 is i1 = V/Rnet = 5/13.33 = 0.375 A
potential drop across R2=R3 = 5-(0.375*10) = 1.25 V
current through R3 is i3 = V/R3 = 1.25/5 = 0.25 A
So the answer is 0.25 A
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5) in RC circuit
v = Vmax*e^(-t/T)
8 = 3.5(e^-5/T)
e^(-5/T)= 8/3.5 = 2.28
-5/T = ln(2.28) = 0.824
T = -5/0.824
T = 6 sec
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