All resistors have the same resistance of 3.00kilo-Ohm. Assume V = 9V. QUESTION

Question

All resistors have the same resistance of 3.00kilo-Ohm. Assume V = 9V.

QUESTION 1:

A. Calculate the current through resistor R6

-I got this correct and got 1.85 mA

B. Calculate the current through resistor R5

-I got this correct and got 1.15 mA

C. Calculate the current through resistor R4

D. Calculate the current through resistor R3

*Need help with C and D.

QUESTION 2:

Link to Image:

http://www.colorado.edu/physics/phys2020/phys2020_fa15/Labs/Physics%202020%20Lab%207_prelab_wk8.pdf

The picture is a typical display you may see on an oscilloscope. Assume that the volts/div setting is 50 V/div and the time/div setting is 5 ms/div.

What are the period, frequency and amplitude of this signal (do not forget units)?

Explanation / Answer

Calculation for Equivalent resistance -
R1+R2 is in Parallel with R3
R1+R2 = 6 , R3 = 3
Eq Resistance btw AB = 6*3 / (6+3) = 2 ohm

Rab is in Series with R4
Eq Resistance = 2 + 3 = 5 ohm

Now, This is in parallel with R5.

Eq Resistance btw AC = 5*3/(5+3) = 15/8 = 1.875

This is in series with R6 = 1.875 + 3 = 4.875 ohm

Current in the circut I = 9/4.875 = 1.85 amp

C)
Current in Resistor R4 = Total Current - Current coming from R5.
Current in Resistor R4 = 1.85 - 1.15
Current in Resistor R4 = 0.7 mA

D)
Let Current in Resitor R3 = I3
I3* R3 = I12* (R1+R2)
I3 * 3 = I12 * 6
I12 = I3/2

I3 + I12 = 0.7
I3 + I3 / 2 = 0.7
I3 = 0.47 amp

Current in Resitor R3, I3 = 0.47 mA

Please post seperate question in seperate post.

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