Lamp Brightness and Potential Dividers (Resistive Circuits, Electricity, Physics)
Physics Made Easy
IN THIS VIDEO YOU WILL LEARN : _ What is meant by the power of a light bulb. _ How a light bulb burning out affects the structure of an electric circuit and the effect on its components. _ How to use the concept of potential divider to help solving questions with resistive circuits.
Typical exam questions will be presented and solved for you. You will also have occasions to test yourself throughout the video.
MUSIC ALBUM
Physics Made Easy « The soundtracks ». Listen to the it here : https://edouardreny.bandcamp.com/album/physics-made-easy-the-soundtracks
Enjoy !
DETAILED CONTENT OF THE VIDEO
Solving a resistive circuit means determining the current passing through all components as well as the the voltage across them. From that information, one can calculate all power transfers that occur within the circuit. For example, the power dissipated by a resistance into thermal energy or by an ideal light bulb into light energy.
Many students manage well doing such tasks. But when it comes to predict what happens when a light bulb burns out, I noticed that some struggle and take too much time solving the question. Hence this video !
What you will learn here are the concepts of power of a light bulb, how to restructure a circuit when a lamp breaks and understand how it affects other components of the circuit. To do so, we need a good understanding of potential dividers. What a great occasion to review this fundamental notion of resistive circuits!
The first section of the video is a review of the notions required to solve this type of question: _ What is the brightness of a light bulb? _ How to restructure an electric circuit when a component burns out? _ Potential dividers, and how to use them to solve circuits?
The second section is on the whiteboard: _ I show how to solve this type of question using the notions reviewed in the first section, _ And then, you try it for yourself with an exercise.
STRUCTURE OF THE VIDEO
00:00 Introduction 00:58 Music Album: Physics Made Easy “The soundtracks” 02:53 Table of content: Light Bulbs and Potential Dividers 03:01 What is the brightness of a light bulb? 04:52 What happens to a circuit when a component burns out? 06:38 Potential divider circuits: an effective tool to solve questions 09:39 How to solve questions with light bulbs using potential dividers 14:50 Train your now skills with resistive circuits (exercise) 17:39 Grabbing a few extra marks at your physics exam
PRIOR KNOWLEDGE REQUIRED
In order to fully grasp the content of this video, the viewer needs to be familiar with the following concepts: _ The 2 laws of Kirschoff (1: sum of currents arriving at a junction = 0, 2: sum of voltages in a closed loop = 0) _ Electric potentials: https://www.youtube.com/watch?v=j3GrOKre__0 _ Electric currents: https://www.youtube.com/watch?v=XzPOGFgsJfE _ How to calculate the equivalent resistance of a circuit block (no video yet…) _ Understand that resistors in parallel have the same voltage across them: https://www.youtube.com/watch?v=ex7kgqhBbvc
CREDITS:
The script, the illustrations, the music and the video were produced and presented by Edouard Reny, Ph.D. in solid state chemistry and private tutor in Physical Sciences.
DO YOU NEED HELP WITH YOUR HIGH SCHOOL PHYSICS?
Edouard provides one-on-one private tuition in Physics (face to face or by Skype). If you wish to know more about this, or contact Edouard, visit his website: https://www.physics-tutor.nl/ or this one (for French speakers: https://www.profdephysique.fr/). ... https://www.youtube.com/watch?v=Ezj1ThAhivU
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