# Really simple Resistor question NEED HELP

• Larrytsai
In summary, the conversation discusses the determination of whether a resistor is in series or parallel with a source. It is mentioned that when resistors have equal voltage, they are in parallel, and when they have equal current, they are in series. However, there is confusion about using this information to determine the equivalent resistance. It is clarified that the equivalent resistance can be either in series or parallel with a voltage source, depending on the specific circuit. A reference question is provided for further understanding and it is explained that when resistors share the same nodes, they are in parallel, and when they only share one common node, they are in series.
Larrytsai
So i have a general question that I came across with source transformations, but this question can be classed as a beginner question.

When I find the equivalent resistance, how do you determine whether or not it is in series or parallel with a source?

when the resistors have equal voltage then they are in parallel. and when they have equal current then they are in series :)

umm can you explain a little more, I don't understand.

I don't understand how I could use that to determine whether or not my equivalent resistance is in parallel or series with sources

Your question doesn't make much sense. "Equivalent resistance" can be either in series or in parallel with a voltage source, depending on what equivalent resistance you're talking about in a circuit.

Sorry, can you look at this question http://www.cramster.com/solution/solution/727803
if you look at the 10 and 40 ohm resistor, why is it when you find their equivalent resistance, they are in series after.

Last edited by a moderator:
oh k nvm i got it thnx.

When resistors share the same nodes they are in parallel, when they only share one common node (with no other resistances nodes sharing that common node) they are in series.

## 1. What is a resistor and what does it do?

A resistor is an electronic component that limits or controls the flow of electric current in a circuit. It does this by providing resistance to the flow of electrons, which helps to regulate the flow of electricity and prevent damage to other components.

## 2. How do I determine the value of a resistor?

The value of a resistor is measured in ohms (symbol Ω) and can be determined by reading the color-coded bands on the resistor. Each color represents a specific number, and by using a color code chart, you can determine the resistance value of the resistor.

## 3. Can I combine multiple resistors to get a specific resistance value?

Yes, resistors can be connected in series or in parallel to achieve a desired resistance value. In series, the total resistance is the sum of each individual resistor, while in parallel, the total resistance is calculated using a formula.

## 4. Why do resistors have different power ratings?

Resistors are designed to dissipate heat, and the power rating indicates how much heat the resistor can safely handle. Higher power ratings allow the resistor to withstand more heat, making it suitable for use in circuits with higher currents.

## 5. Can I use any resistor in a circuit or are there specific types for different applications?

There are various types of resistors, including carbon composition, metal film, and wire wound. Each type has its own characteristics and is suitable for different applications. It is important to choose the correct type of resistor for your circuit to ensure proper functionality.

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