How to Find the Current in a 6 Ohm Resistor?

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SUMMARY

The discussion focuses on calculating the current through a 6 Ohm resistor in a circuit. The equivalent resistance was determined to be 3.2 Ohms, with a voltage of 32 volts across it. The current through the right branch of the circuit was calculated to be 8 A, with 2 A flowing through a 16 Ohm resistor. Kirchhoff's Voltage Law was applied to find the voltage across the 6 Ohm resistor, confirming the calculations made by the participants.

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hello


Find the power dissipated in the (6 ohm) resistor.

the circuit is in the attachments


i know that P in the resistor = (i^2)*R
but how can i find the current in that 6 ohm resistor?
thanks
 

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Think about first combining resistors. Reply back to show your work for that. From there, it should be simple to get the I in the 6ohm resistor.
 
Answer these questions in order and you'll get there.

1.) What is the equivalent resistance of this circuit?
2.) What is the voltage across that equivalent resistance?
3.) What is the current through the right branch of the circuit? (Mr. Ohm will help you here)

Now you're ready to compute the power dissipated in that resistor.
 
Tom Mattson said:
Answer these questions in order and you'll get there.

1.) What is the equivalent resistance of this circuit?
2.) What is the voltage across that equivalent resistance?
3.) What is the current through the right branch of the circuit? (Mr. Ohm will help you here)

Now you're ready to compute the power dissipated in that resistor.

i got R equivalent = 3.2 ohm
the voltage across R equivalent = 32 volts
I in the right branch = 8 A
am i right?
 
Ack! You know what, I made the problem a little too simple in my head. You're right about the equivalent resistance and the voltage across it. That means that the voltage across the 16 Ohm resistor is 32V, so there's 2A going through it. So the other 8A goes into the other resistors. You can apply Kirchhoff's Voltage Law at this point to get the voltage across the 6 Ohm resistor.
 
Tom Mattson said:
Ack! You know what, I made the problem a little too simple in my head. You're right about the equivalent resistance and the voltage across it. That means that the voltage across the 16 Ohm resistor is 32V, so there's 2A going through it. So the other 8A goes into the other resistors. You can apply Kirchhoff's Voltage Law at this point to get the voltage across the 6 Ohm resistor.

thats exactly what i did ;)
thanks you!
 

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