# Physics 100: Mastering Ohm's Law and DC Circuits

## What you'll learn

- Able to calculate voltage, current, and power of any DC circuit.
- Learn how to deal with combination of resistors
- Understand energy in electric circuits
- Learn how to apply Kirchhoff's Laws
- Ability to analyze circuits with resistors and capacitors

## Requirements

- Basic algebra (Most of the class 95%)
- Some Calculus is required to understand the charging and discharging of capacitors (5% of the class)

## Description

This is a comprehensive course on Ohm's law and Direct-Current (DC) circuits, which are circuits where the **direction** of the current in a circuit element does not very with time. The topics in covered in this class are:

**1. Current and the Motion of Charges**

- Definition of electric current and current density
- Finding the drift velocity and density number

**2. Resistance and Ohm's Law**

- Review of Ohm's law
- Understanding the difference between Resistance and Resistivity
- Understand the Color Code for Resistors
- Connection to the Electric Field

**3. Energy in Electric Circuits**

- Review of Power
- Rate of Potential Energy Loss
- Rate of Power Dissipated in a Resistor
- EMF's and Batteries
- Internal Resistance and Maximum Power Delivered

**4. Combinations of Resistors**

- Simplifying Electric Circuits
- Equivalent Resistors
- Resistors in Series vs Parallel and how to identify the different combinations

**5. Applying Kirchhoff's Rules to Circuits**

- Problem solving strategies for single loop circuits
- Problem solving strategies for multi-loop circuits
- Finding the potential across resistors and between any two points in a circuit
- Understand measuring devices such as ammeters and voltmeters.

**6. RC Circuits**

- Learn how to analyze RC circuits in the short and long time limits
- Charging vs discharging a Capacitor
- Understand RC time constant
- Understand energy conservation during charging and discharging a capacitor.

The class is a combination of lectures and tutorial. I've put together a series of example problems, algebraic and conceptual, to help you better understand the material.

The are over 60 fully solved circuit problems in this class.

There are 4 problem set in the course:

**1) Multiple Short Questions**

**2) Circuits with Resistors and EMF's**

**3) RC Circuits**

**4) Conceptual Problems**

If you watch the lessons, work on the problems, i'm certain you'll become very proficient at analyzing DC circuits.

If at any point during any of my classes you didn't understand something, just message me and i'll make it right. Physics Ninja always has your back!

Happy Learning,

Dr. E.

Physics Ninja and Expert Physics and Math Teacher

## Who this course is for:

- Students looking to understand how to analyze basic DC electrical circuits containing power supplies, resistors, and capacitors
- Students studying for exams
- AP physics students

## Course content

- Preview03:07

## Instructor

My name is Dr. E. I'm a physicist and I love teaching math and physics. I obtained my Ph.D. in physics and have been teaching physics now for over 15 years. I currently work as an engineer in mobile consumer electronics and am an adjunct physics faculty at Harper College in Chicago. I previously taught physics for the Princeton Review with a focus on MCAT physics and also trained new physics teachers. Visit my website to learn more about me.

I created these courses to make quality education more affordable. I tutor a lot of students and i know how expensive it can be to find a great, reliable tutor. All of my classes are a mix of lectures, where i review the basic theory and go over key concepts, and tutorials, where i show you how to solve problems and help you develop your own problem solving strategies. The classes contain several example problems for each topic and at the end i typically put together a series of problems ranging in difficulty for you to practice on your own. After you've tried to solve the problems on your own, come watch the videos and see how a Physics Ninja would solve the problem.

All of my courses are comprehensive which means they tend to be longer than other courses. I don't believe you can really learn physics with a 5-hour course covering a semesters worth of physics. To learn physics, you have to practice solving problems, all types of problems, conceptual and algebraic.

I'm committed to all of my students and reply to all emails and questions within 24 hours.

Happy learning!

Dr. E.

Physics Ninja