Help with Question 3 would be very much appreciated. The figure at the right sho

Question

Help with Question 3 would be very much appreciated.

The figure at the right shows the same four resistors from last week's pre-lab circuit shown above, but connected in a parallel circuit with the same battery as in that circuit. Take the current from the battery I_p, as 400 mA. What is potential difference across each resistor? How do you know? What is the current through each of the resistors? How do you know? If we added a fifth resistor in a fifth branch how would that affect the potential difference across each of the resistors, the current through each of the resistors and the current I_p?

Explanation / Answer

remember these about Combination of Resistors

if R1 and R2 are the resistances connected in series then effective resiatcne Rnet = R1+R2

if R1 and R2 are connected in parallel, then 1/Rnet =1/R1 +1/R2 or Rnet = R1R2/(R1+R2)

same current passes through each of the ressitor in series combination and

same votage passes through eacf of the resistor in parallel combination

apply ohms law V = iR

where V = volatge and i = current

so when 5th resistor is added.

Rnet decrases, Current I in the ckt increases

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