Courses
Courses for Kids
Free study material
Offline Centres
More
Store

# Equivalent Resistance Formula

Reviewed by:
Last updated date: 11th Aug 2024
Total views: 386.1k
Views today: 3.86k

## Introduction to Equivalent Resistance Formula

Equivalent resistance formula refers to the resistance of resistors connected in series, parallel or a combination of both. This formula helps us calculate the equivalent resistance easily when two or more two circuit elements are combined together to form complex electrical circuits and the total resistance of the circuit is measured.

### Importance of Studying Equivalent Resistance Formula

It is important to study equivalent resistance formulas because it is used to calculate the total equivalent circuit without drawing them physically. It helps us find out the effective value of a resistor that is connected in a series connection or parallel combination if an unknown current flows through a particular branch of a complex electrical circuit.

# Here are few important  ways for studying equivalent resistance formula:

## 1)  Make flashcards-

Flashcards are one of the best ways to study. There is no better way than making your own! Get a piece of paper and label it "equivalent resistance" on one side, 𝑘 𝐿 = R in series + R parallel, then make two columns labeled "R in series", which will be all terms that follow this formula (the left column), and "R parallel", where you'll solve for resistors when they're in parallel (right column). List out each term separately including units with your first attempt at writing them down. Then go back through and try to simplify or rewrite these equations so they don't have any variables.

## 2) Learn the basics-

It is important to understand the basics of equivalent resistance before you try to apply it. This includes understanding Ohm's law ( V = IR ), series and parallel circuits, and how to solve for resistances in each scenario. Once you have a strong foundation, the concepts of equivalent resistance will be much easier to understand.

### 3) Practice-

Start practicing applying the equation to circuits! Try solving for resistances in a few simple series and parallel circuit problems. These are great examples of equivalent resistance because you can simply plug your numbers into the formula. If you're feeling confident, try applying it to slightly harder circuits that have multiple branches or components connected in different ways.

## 4) It's important not to be overwhelmed when practicing-

If you find yourself struggling with these equations, just take a step back and review what you know about the basics before moving forward again so these concepts don't get too difficult all at once. When studying, make sure you understand why each step is happening rather than just memorizing everything without understanding how it works.

### 5) Gain practical knowledge-

It is important to gain practical knowledge along with the theory. This means working through examples and solving problems as you go. Not only will this help your understanding of the material, but it will also give you the skills you need to apply these concepts.

## FAQs on Equivalent Resistance Formula

1. How much importance does equivalent resistance have in the actual world?

Equivalent resistance is a very important formula in the actual world. It helps us calculate total equivalent circuits without drawing them physically. It helps us find out the effective value of a resistor that is connected in a series connection or parallel combination if an unknown current flows through a particular branch of a complex electrical circuit.

2. What should I do if I get stuck while practicing the equivalent resistance formula?

If you get stuck while practicing, take a step back and review what you know about basics before moving forward again so these concepts don't get too difficult all at once. When studying, make sure you understand why each step is happening rather than just memorizing everything without understanding how it works . This will help you learn to remember the material better.

3. I have heard about the 1/2 rule but did not understand this also correctly. What does this mean?

This means there are two resistors in parallel so their equivalent resistance will be half of each individual resistors' value because both drop the same voltage potential at any given point. For example if 2 10Ω resistors are connected in parallel then the equivalent resistance will be 5 Ω and at any given point they both drop 1V potential from input voltage which is 10V.

4. What are the main factors other than resistance that affect the equivalent resistance of the resistor?

There are other parameters which affect the value of equivalent resistance apart from values of resistors. It includes wire length, insulation type, thickness etc. This is why it is very important to consider not only values but other factors while selecting an appropriate resistor to use in different situations where the actual situation may be different from one expected or tested.

5. What about two resistors in parallel?  Will they act as one same resistance or two different resistances?  And what will be their combined equivalent resistance?

Two resistors in parallel means that both are in same direction to flow of current i.e. when placed head-to-tail, so there is no voltage potential difference between them at any given point but total current flowing through them will be divided equally by each individual resistor which mean if we connect 2 10Ω in parallel the equivalent resistance will be 5 Ω and total current passing through this assembly also will 0.5 A because equal division of 0.5A per each resistor.

6. What is Resistance? How does the Resistance differ from the Equivalent Resistance?

Resistance is the opposition that a material offers to the flow of electric current through it. It is represented by the uppercase letter R. The standard unit of resistance is the ohm, sometimes written out as a word, and sometimes we symbolize it by the uppercase Greek letter omega (Ω). The term resistance refers to the way we measure or determine how much a circuit component resists the flow of electricity, or current, passing through it. More resistance means less current flows through the circuit and vice-versa. The equivalent resistance is a different way of indicating 'total effective’ resistance, which we calculate differently for series and parallel circuits.