For the circuit shown in the figure, find the current through and the potential

Question

For the circuit shown in the figure, find the current through and the potential difference across each resistor.

Part A Find the current through 3 ? resistor.

Part B Find the potential difference across 3 ? resistor.

If anyone can stick around, after I have these parts C-H become available and I'm sure I'll need help! (This stuff is terrible!) ;)

For the circuit shown in the figure, find the current through and the potential difference across each resistor. Part A Find the current through 3 ? resistor. Part B Find the potential difference across 3 ? resistor.

Explanation / Answer

Solving:

As you can see the 4, 48 and 16 ohms resistors are all parallel and the 3 ohms resistor continues in serial with them.

So you need to find an equivalent value resistor for this group of three resistors, then: 1/R =1/4+1/48+1/16; 1/R=1/3 so R=3 ohms

Now you have two serial resistors with 3 ohms each one, and the uniq resistance is 6 ohms.

Now using the formula I=V/R you can fin the total current: I=12/6=2 A

Answer:

A) Current in 3 ohms resistor is 2 A (because it is in serial position with the others or with the three equivalent resistance)

B) Using the formula V=I*R you can calculate the potencial difference in this resistor. So: V=2*3=6 v

I hope this is useful for you my friend.

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