Electric circuit & missing resistance/voltage

In summary, the conversation is about finding missing resistances, currents, and voltages in a circuit. The first picture attached shows the given information and the second picture attached shows the attempt at a solution. The conversation also mentions a question about R3 and R4 having the same voltage and the total voltage across R3+R4 being 1.2 V.
  • #1
pebbles3
9
0

Homework Statement


I'm supposed to find the missing resistances, currents, and voltages from the first picture (attached)

Homework Equations


v = IR
R = V/I
I=V/R

The Attempt at a Solution


My attempt is in the second attached picture. I'm completely lost on what to do for R3. Would R3 and R4 have the same voltage? I'd really appreciate some help with this.
 

Attachments

  • diagram1.png
    diagram1.png
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  • diagram2.png
    diagram2.png
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  • #2
Anyone?
 
  • #3
R3+R4 is in parallel with R2. What does that tell you about the total voltage across R3+R4?
 
  • #4
The voltages are the same in parallel, right? So.. would the total voltage across R3+R4 equal 1.2 V?
 
  • #5
pebbles3 said:
The voltages are the same in parallel, right? So.. would the total voltage across R3+R4 equal 1.2 V?

Yes, of course.
 
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FAQ: Electric circuit & missing resistance/voltage

1. What is an electric circuit?

An electric circuit is a path or loop through which electric current can flow. It typically consists of a power source, conductors, and electrical components such as resistors, capacitors, and inductors.

2. How do you calculate the missing resistance or voltage in a circuit?

To calculate the missing resistance or voltage in a circuit, you can use Ohm's Law, which states that voltage equals current multiplied by resistance (V=IR). If you know the values of two of these variables, you can use this formula to solve for the missing one.

3. What is the difference between series and parallel circuits?

In a series circuit, all components are connected in a single loop, meaning the same current flows through each component. In a parallel circuit, components are connected in separate branches, so the total current is divided between them. This means that the voltage across each component is the same in a series circuit, while the voltage across each branch is the same in a parallel circuit.

4. How does the addition of resistors affect the total resistance in a circuit?

In a series circuit, the total resistance is equal to the sum of all individual resistances. This means that adding resistors in series increases the total resistance in the circuit. In a parallel circuit, the total resistance is less than the smallest individual resistance due to the multiple paths for current to flow.

5. How does voltage affect the flow of current in a circuit?

Voltage is the driving force that pushes electric current through a circuit. Higher voltage means more energy is available to move the electrons, resulting in a larger current. Lower voltage means less energy, resulting in a smaller current. However, the resistance in the circuit also affects the flow of current. The higher the resistance, the lower the current, regardless of the voltage.

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