New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Test #3 Study Guide

by: Caleb Jordan

Test #3 Study Guide ECE 3413

Caleb Jordan
GPA 3.01

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

This is a comprehensive study guide of what will be covered on exam #3.
Intro to Electronic Circuits
Mrs. Moorhead
Study Guide
Circuits, Intro to Circuits, Introduction to Circuits
50 ?




Popular in Intro to Electronic Circuits

Popular in Electrical Engineering

This 7 page Study Guide was uploaded by Caleb Jordan on Saturday February 27, 2016. The Study Guide belongs to ECE 3413 at Mississippi State University taught by Mrs. Moorhead in Winter 2016. Since its upload, it has received 193 views. For similar materials see Intro to Electronic Circuits in Electrical Engineering at Mississippi State University.


Reviews for Test #3 Study Guide


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 02/27/16
Intro to Circuits Test #3 Study Guide Topics Covered:  Operational Amplifiers  Capacitors  Inductors 1. Operational Amplifiers (op­amps): There are a few different types of op­amps that I will cover in this study guide,  but before I go into them I’m going to cover things that apply to all types of op­ amps. So let’s get started with the general information. Op­amps in General: Here’s a basic picture of an op­amp that I got out of the book. The inner  workings of an op­amp are really complicated and not something that we are  expected to learn in this class. However, there are several properties that you  should know, even if you don’t understand why it works this way.  V+ ­ V­ = 0V  Following from the previous point, V+ = V­  I(in) is assumed to be 0A o There is current leaving an op­amp but there is no current going in  R(in) is assumed to be infinite.  R(out) is assumed to be 0 Ohms.  V(out) = a constant A(called gain) * V(in) o V(in) in this case is the value of the voltage going into the op­ amp, which can be either V+ or V­ since they are equal. That is all the basics you need to know. Before I go into a few specific types, another assumption that has helped me solve these circuits. If you are doing  nodal analysis on the circuit you can ignore the wires leading into the op­ amp because they have no current flowing through them. That’s not to say  that you can completely ignore the op­amp, just that you don’t need to  mention it in your equation. If this confuses you, I’m sorry but this is very  hard to explain. Just try a few practice problems. Inverting Amplifier: An Inverting Amplifier has the voltage source connected to the negative  terminal and the positive terminal is grounded. This type isn’t particularly  important other than just knowing the definition. If you like to see the  formulas, they are on page 346 of the Intro to Electrical Engineering book. I  found that most of the time they don’t apply and even when they do, you can solve the circuit without them. Summing Amplifier: The Summing Amplifier is a specific type of Inverting Amplifier that is used to sum multiple voltage sources. Differential Amplifier: This type of Amplifier focuses on amplifying the difference between two  different voltage sources.  So as you can see, in this case there is a voltage source connected to each  terminal of the op­amp. There are a few equations in the book that I don’t  find useful but if you’re curious, p353. You can solve this one the same way, nodal analysis. Just remember that the op­amp has no current flowing into it. 2   Capacitors & Inductors: Capacitors and Inductors are very similar so I put them in the same section. To  understand Capacitor and Inductors you should think of a spring. When you  push a spring together, it stores potential energy. Then when you release the  spring, it releases its potential energy as kinetic energy. Capacitors and  Inductors are circuit elements that do exactly that. They store energy and  release it when it is needed. The difference between them is the way in which  they store energy. Note: These components only work with AC current. In a DC current they  cause an open circuit. Capacitors: Capacitors are comprised of two plates with a dielectric material between them.  The measurement of the devices ability to store and discharge energy is known  as Capacitance and is measure by the unit Farad (F). F = Coulombs/Volt As you can see, the current through a Capacitor is equal to the Capacitance  multiplied by the derivative of the voltage across the Capacitor. Combining Capacitors in a circuit works the exact opposite from combining  resistors. If you have two Capacitors in parallel, then you add their Capacitance. If they are in series, you follow the rules for resistors in parallel. I just put a  picture here of a circuit with a few Capacitors in it so you know what they look  like. The energy stored in a Capacitor can be calculated with the following equation.  Sorry I don’t have a cool trick for you. It’s just a formula. Memorize it. That’s  it. So your energy is equal to half the Capacitance multiplied by the voltage  squared. Inductors: An Inductor is a wire coil around a core. These use electromagnetic induction  to store energy, thus the name Inductors. If you are not familiar with  electromagnetic induction, it’s the idea of creating current using a magnetic  field. There are lots of good pictures in the book on page 139 that will help you  understand this concept if you’re having trouble. Like above, here is your current­voltage relationship for Inductors: The voltage across the Inductor is equal to the Inductance (L) multiplied by the  derivative of the current through the Inductor. So L is your Inductance which is measured in henrys (H). A henry is equal to a volt­second divided by amps. Inductors store kinetic energy instead of potential energy but have a very  similar equation to Capacitors:   The kinetic energy stored is equal to half your Inductance times the current  through the Inductor squared. The last thing you need to know about Inductors is combining circuit elements.  The rules for combining Inductors are exactly the same as resistors. I’ll put a  picture here of a circuit with Inductors in it. Just review combining resistors for  how to combine Inductors. That should be it. I hope this helps you study. I know making this thing really  helped me. I hope you enjoyed it. If you did check back with me in the future. I  will be posting a study guide for every test this semester. Happy studying and  good luck on the test!!


Buy Material

Are you sure you want to buy this material for

50 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Amaris Trozzo George Washington University

"I made $350 in just two days after posting my first study guide."

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.