Find the current by adding the resistances

  • Thread starter ashleydeer7
  • Start date
  • Tags
    Current
In summary, the conversation is about solving a circuit problem involving capacitors and resistors. The first problem involves a series circuit where the current must be found using Ohm's law and then the voltage drop across each resistor can be used to determine the voltage seen by the capacitors. The second problem involves a parallel circuit where the current in each branch can be easily found and used to determine the voltage at each end of the capacitor.
  • #1
ashleydeer7
1
0

Homework Statement




http://i260.photobucket.com/albums/ii10/alexlovely77/af.jpg

Homework Equations



q=cv

The Attempt at a Solution



i just want help with 1 of the 3 (anyone...)
so the first one...the current thru the capacitors is 0
then u have to find voltage right?
but how do u find the voltage thru those resistors?
r the 3 resistors in series? or do the capacitors make them not in series?
 
Last edited by a moderator:
Physics news on Phys.org
  • #2
In the first, the resistors form a simple series circuit. Find the current by adding the resistances, then apply Ohms law. Once you have the current you can find the voltage drop across each resistor. This will give you the voltage seen by the capacitors.


In the second you can easily find the current in each branch of the parallel circuit. You can then find the voltage at each end of the cap. The difference is the voltage used to find the charge.
 
  • #3


I would like to provide some guidance rather than directly solving the problem for you. First, we need to understand the given circuit and the components involved. The diagram shows two capacitors and three resistors connected in a circuit. The capacitors are connected in parallel, while the resistors are connected in series. This means that the voltage across the capacitors is the same, while the current through each resistor is the same.

To find the voltage across the resistors, we can use Ohm's Law (V=IR). We know the current (which is the same for all three resistors) and we can calculate the total resistance by adding the individual resistances. Once we have the total resistance, we can use Ohm's Law to find the voltage across each resistor.

As for the voltage across the capacitors, we can use the formula q=cv, where q is the charge stored in the capacitor, c is the capacitance, and v is the voltage. Since the current through the capacitors is 0, we can assume that there is no charge stored in them, and therefore the voltage across the capacitors is also 0.

I hope this helps guide you in the right direction for solving the problem. Remember to always understand the components and the circuit before attempting to solve it.
 

Related to Find the current by adding the resistances

What is the concept of finding the current by adding resistances?

The concept of finding the current by adding resistances is based on Ohm's Law, which states that the current flowing through a conductor is directly proportional to the voltage and inversely proportional to the resistance. By adding multiple resistances in a circuit, we can calculate the total resistance and use Ohm's Law to find the current flowing through the circuit.

What is the formula for finding the total resistance in a circuit with multiple resistors?

The formula for finding the total resistance in a circuit with multiple resistors is R(total) = R1 + R2 + R3 + ..., where R1, R2, R3, etc. are the individual resistances. This formula applies to both series and parallel circuits.

Can resistors be added in any order when calculating the total resistance?

Yes, resistors can be added in any order when calculating the total resistance as long as they are all connected in the same circuit. This is because resistors in series add up to create a larger total resistance, while resistors in parallel decrease the total resistance.

How does adding more resistors affect the total resistance and current in a circuit?

Adding more resistors in series will increase the total resistance and decrease the current flowing through the circuit. On the other hand, adding more resistors in parallel will decrease the total resistance and increase the current flowing through the circuit.

What are some practical applications of finding the current by adding resistances?

Finding the current by adding resistances is useful in many practical applications, such as designing electrical circuits, calculating power consumption, and troubleshooting faulty circuits. It is also essential in fields such as electronics, engineering, and physics.

Similar threads

  • Introductory Physics Homework Help
Replies
4
Views
1K
  • Introductory Physics Homework Help
Replies
14
Views
794
  • Introductory Physics Homework Help
Replies
2
Views
973
  • Introductory Physics Homework Help
Replies
8
Views
388
  • Introductory Physics Homework Help
Replies
6
Views
249
  • Introductory Physics Homework Help
Replies
4
Views
2K
  • Introductory Physics Homework Help
2
Replies
44
Views
2K
  • Introductory Physics Homework Help
Replies
3
Views
1K
  • Introductory Physics Homework Help
Replies
3
Views
1K
  • Introductory Physics Homework Help
Replies
13
Views
1K
Back
Top