A bit of help with KCL and ohms law please

In summary, the conversation discusses solving circuit problems using Kirchoff's Current Law and Ohm's Law. The speaker has attached a picture showing the problem and has used KCL to answer parts (a) and (b), with answers of 0.6 and 1 respectively. For parts (c) and (d), the speaker has used the equation v1=r1/(r1+r2)*v and has answers of 1 and 5 respectively. Finally, for part (e), the speaker has used the power equation p=VI with V=6 and I=1, resulting in an answer of 6. They also mention needing the total voltage across two resistors that add up to 12 K.
  • #1
twister16th
4
0
i have attached a picture showing the problem;
just wanting to know if my working out and reasoning is correct please.

http://img29.imageshack.us/img29/5412/questionsq.jpg

The Attempt at a Solution


i have used KCL to answer (a) and (b) and have answers 0.6 and 1 respectively.

for (c) and (d) i have used the equation v1=r1/(r1+r2)*v
and have answers 1 and 5 repectively.

for (e) i used power equation p=VI where V is 6 and I is 1 and have the answer 6.
thanks in advance for any help i get :)
 
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  • #2
I see no picture.
 
  • #3
ah sorry, it appears on mine, if not here is the direct link.


http://img29.imageshack.us/img29/5412/questionsq.jpg
 
Last edited by a moderator:
  • #4
The first two look OK.

What is the voltage across a resistor if it is 12 K and it has 0.4 mA flowing in it?
 
  • #5
as in use Ohm's law to find it out?
 
  • #6
Yes, you can see two resistors that add up to 12 K.

You need the total voltage across them.
 
  • #7
so v1=0.8 and v2 =4.0?
oh and thankyou for your help :), its really appreciated.
 

1. How do I apply KCL (Kirchhoff's Current Law) in a circuit?

KCL states that the sum of all currents entering a node in a circuit must equal the sum of all currents leaving that node. To apply KCL, simply write an equation using the currents entering and leaving the node, and solve for the unknown current.

2. What is the formula for Ohm's Law?

The formula for Ohm's Law is V=IR, where V is voltage, I is current, and R is resistance. This formula shows the relationship between these three quantities in a circuit.

3. How do I calculate resistance using Ohm's Law?

To calculate resistance, rearrange the formula for Ohm's Law to R=V/I. This means that resistance is equal to voltage divided by current.

4. Can Ohm's Law be applied to all circuits?

Yes, Ohm's Law can be applied to all circuits, as long as the circuit is linear and contains only resistive elements. Non-linear circuits, such as those with diodes or transistors, do not follow Ohm's Law.

5. How can I use Ohm's Law to find the voltage drop across a resistor?

To find the voltage drop across a resistor, use the formula V=IR, where V is the voltage drop, I is the current flowing through the resistor, and R is the resistance of the resistor. Simply plug in the known values and solve for V.

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