UrbanPro

Take Class 12 Tuition from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Search in

What is the difference between impedance and resistance?

Asked by Last Modified  

Follow 2
Answer

Please enter your answer

Stock Market Trader & Trainer

By its very nature a DC circuit will not exhibit any form of Reactance, therefore opposition to current flow will always be measured in Resistance. Reactance exists in two forms, Capacitive & Inductive. Impedance can therefore be thought of as the opposition of electrical current flow in a AC circuit
Comments

Tutor

Impedance is complex consist of resitance and reactance (capacitor and or inductor), while resistance is purely real, consist of resistor only.
Comments

The Artist

Impedance comes into play usually when the circuit is AC powered and has Capacitors&/Inductors&/Resistors. Impedance is the collective resistance due to both reactance and Resistance (Ohmic). On the other hand, Resistance is just the ohmic resistance offered by a resistor.
Comments

Expert Teacher

Resistance is a concept used for DC (direct currents) whereas impedance is the AC (alternating current) equivalent. Resistance is due to electrons in a conductor colliding with the ionic lattice of the conductor meaning that electrical energy is converted into heat. Different materials have different...
read more
Resistance is a concept used for DC (direct currents) whereas impedance is the AC (alternating current) equivalent. Resistance is due to electrons in a conductor colliding with the ionic lattice of the conductor meaning that electrical energy is converted into heat. Different materials have different resistivities (a property defining how resistive a material of given dimensions will be). However, when considering AC you must remember that it oscillates as a sine wave so the sign is always changing. This means that other effects need to be considered - namely inductance and capacitance. Inductance is most obvious in coiled wire. When a current flows through a wire a circular magnetic field is created around it. If you coil the wire into a solenoid the fields around the wire sum up and you get a magnetic field similar to that of a bar magnet on the outside but you get a uniform magnetic field on the inside. With AC since the sign is always changing the direction of the field in the wires is always changing - so the magnetic field of the solenoid is also changing all the time. Now when field lines cut across a conductor an emf is generated in such a way to reduce the effects that created it (this is a combination of Lenz's and Faraday's laws which state mathematically that E=N*d(thi)/dt , where thi is the magnetic flux linkage). This means that when an AC current flows through a conductor a small back emf or back current is induced reducing the overall current. Capacitance is a property best illustrated by two metal plates separated by an insulator (which we call a capacitor). When current flows electrons build up on the negative plate. An electric field propagates and repels electrons on the opposite plate making it positively charged. Due to the build up of electrons on the negative plate incoming electrons are also repelled so the total current eventually falls to zero in an exponential decay. The capacitance is defined as the charge stored/displaced across a capacitor divided by the potential difference across it and can also be calculated by the size of the plates and the primitivity of the insulator. read less
Comments

15yrs exp. Math, Computers, English & Hindi Trainer. Improvement In Scores Guaranteed.

DC circuit will NOT exhibit Reactance (exists in Capacitive /Inductive form), opposition to current flow in DC circuits will be measured in Resistance.
Comments

Math

opposition in current flow in dc circuit is resistance(R) but in ac circuit it is called impedence(Z).
Comments

Math Teacher

resistancece is a concept used for DC (direct currents) whereas impedance is the AC (alternating current) equivalent. Resistance is due to electrons in a conductor colliding with the ionic lattice of the conductor meaning that electrical energy is converted into heat
Comments

M.Tech in Microelectronics with 13+ years industry experience

Resitance is not affected by operating frequency but impedance is. Impedance is given by Z = R + jX. X is given by X= WL or -1/WC for inductor or capacitor in the case of AC circuits. For DC analysis Z=R.
Comments

Tutor

A DC circuit will not exhibit any form of Reactance, therefore opposition to current flow will always be measured in Resistance. In addition to Resistance, AC circuits also exhibit Reactance.. Reactance exists in two forms, Capacitive & Inductive. The combination of Reactance & Resistance is called Impedance....
read more
A DC circuit will not exhibit any form of Reactance, therefore opposition to current flow will always be measured in Resistance. In addition to Resistance, AC circuits also exhibit Reactance.. Reactance exists in two forms, Capacitive & Inductive. The combination of Reactance & Resistance is called Impedance. Impedance can therefore be thought of as the opposition of electrical current flow in a AC circuit. read less
Comments

Physicist UPSC 2010 batch

For understanding, please note that : 1. Impedance and resistance, both refer to opposition to flow of electrons. but resistance is more defined by the nature of the material,length and cross sectional area. whereas impedance is due to a result of inductance(lens law) and capacitance.
Comments

View 102 more Answers

Related Lessons

Integration of sin x from first principles
y' = Lt / x x => 0 Therefore if y = sin x y' = Lt / x x=>0 y' = Lt / x x => 0 =>Lt / x x => 0 => Lt / x x => 0s =>sin x Lt(cos...
P

Pramod . | 18/10/2021

1 0
0

To Get Success
ONLY TRY TO BECOME A MAN OF VALUES.....

Ashish Sahu | 21/10/2020

0 0
0

Basic Accounting Procedures – II Journal
I. Journalise the following Transactions – Chapter 4 (Book Examples) Jan 1, 2004 – Saravanan started the business with Rs. 1,00,000. Jan 3, 2004 – Received cash from Balan Rs. 25,000 Feb...

Alex J | 04/08/2020

0 0
0

Recommended Articles

Mohammad Wazid is a certified professional tutor for class 11 students. He has 6 years of teaching experience which he couples with an energetic attitude and a vision of making any subject easy for the students. Over the years he has developed skills with a capability of understanding the requirements of the students. This...

Read full article >

Raghunandan is a passionate teacher with a decade of teaching experience. Being a skilled trainer with extensive knowledge, he provides high-quality BTech, Class 10 and Class 12 tuition classes. His methods of teaching with real-time examples makes difficult topics simple to understand. He explains every concept in-detail...

Read full article >

Radhe Shyam is a highly skilled accounts and finance trainer with 8 years of experience in teaching. Accounting is challenging for many students and that s where Radhe Shyam s expertise comes into play. He helps his students not only in understanding the subject but also advises them on how to overcome the fear of accounts...

Read full article >

Sandhya is a proactive educationalist. She conducts classes for CBSE, PUC, ICSE, I.B. and IGCSE. Having a 6-year experience in teaching, she connects with her students and provides tutoring as per their understanding. She mentors her students personally and strives them to achieve their goals with ease. Being an enthusiastic...

Read full article >

Looking for Class 12 Tuition ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you
X

Looking for Class 12 Tuition Classes?

The best tutors for Class 12 Tuition Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Take Class 12 Tuition with the Best Tutors

The best Tutors for Class 12 Tuition Classes are on UrbanPro

Book a Free Demo

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more