please explain as much as possible for question 5, I know 2-4 are right Bookmark

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please explain as much as possible for question 5, I know 2-4 are right

Bookmarks Window Help a ) 100% blackboard.und.edu r 28 Homework-PHYS 252: University Review Test Submission: Chapter rk-PHYS s Question Completion Status: QUESTION 2 i poin The next few problems will show you how to find the voltage that will result in a certain power delivered to a single resistor in the circuit. a. In the diagram below, what minimum current would result in 20W of power delivered to the left resistor? Notice that this only depends on the single resistor and is independent of the rest of the circuit. 100 ? a 1002 W (l 100 ? 44721359 QUESTION 3 1 points b. What is the equivalent resistance of the three resistors? 150 QUESTION 4 1 points c. What potential difference applied to points a and b would result in the current found in part a?

Explanation / Answer

So you have found out that

Req = 150 ohm

Current in 100 ohm = 0.44721 Amp

Potential difference between a and b = 67.082 V

Now Now remember in resistors parallel combination voltage distribution in each part will be same and in series combination current distribution in each resistor will be same.

100 and 100 are in parallel, then

Rp = 100*100/(100 + 100) = 50 ohm

Total current in circuit = total current in 100 ohm (on left) = total current in both parallel resistor (50 ohm)

Total current in resistors on right = 0.44721 Amp

Voltage in resistors on right = i*Rp = 0.44721*50 = 22.3605

Now Since both are in parallel, So voltage on both of them will be same

Voltage in upper 100 ohm = Voltage in lower 100 ohm = 22.3605 V

Power in both of them = P = V^2/R

P = 22.3605^2/100 = 4.9999 = 5.0 W

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