Circuits with Series and Parallel Wiring

azizlwl

Now you got 2 Amps flowing through the equilvalent parallel resistors and through 6 Ohms resistor.

Now what is the voltage across each of the parallel resistors?
From this voltage drop, you calculate the current flow.

What is required here is to find the current flowing through the equivalent parallel resistors of two 10 Ohms resistors.

Snape1830

V-RI
V=10(2)
V=20 V
V=20(2)
V=40 V

So across the 10 ohm resistors, the voltage drop is 20 V
Across the 20 ohm resistor the voltage drop is 40 V?

That 40 can't be right, though?

azizlwl

Wrong.
With equivalent parallel resistors, you have only 2 resistors. 6 ohms and 4 ohms.
What is the voltage drop across 4 ohms resistor.
This voltage drop is identical to all the resistors in parallel.
Remember the voltage across all resistore in parallel are equal.

Snape1830

Oh, right, I misread the question.
V=2(4)
V=8 Volts

ehild

So the voltage across the resultant of the parallel resistors is 8 V. You get the current through each of them if you divide that 8 V by the resistances.
What is the current that flows through the ammeter?
Remember Kirchhoff's nodal law.

ehild

Attached Thumbnails

 

Snape1830

Kirchoff's loop rule? The current going in equals the current coming out.
So do I find the current through of the parallel resistors and then add them up...because that comes out to 2 and 2 is wrong.

ehild

I wrote Kirchhoff's node rule.

The ammeter measures the current that flows through it. Does I₂₀ ,represented by the green arrow flow through the ammeter?

ehild

Snape1830

No? So it would be 1.6 A?

And thanks for taking the time to edit the picture!

ehild

Correct .

ehild

Snape1830

Ok! So now part b how much power dissipated through a 10 ohm resistor. The power equation.
P=IV
or
P=I²(r)
or
P= v²/R

I tried a few answers but none of them work.

ehild

What is the voltage across the 10 ohm resistor?

ehild

Snape1830

8? It seems wrong for some reason

NascentOxygen

They don't?

How much current is flowing in just one of the 10Ω resistors?

Snape1830

.8 amps?

NascentOxygen

Then I²·R =
and what makes you think this isn't right?

Snape1830

It would be 6.4, and it's wrong because I plugged in the answer and it said it was wrong.

NascentOxygen

6.4 watts is correct.