Click here to see more videos: https://alugha.com/FuseSchool CREDITS Animation & Design: Reshenda Wakefield Narration: Dale Bennett Script: Bethan Parry Do you ever have arguments at home about leaving appliances on and wasting electricity? In this video, we are going to look at measuring energy use, in electrical appliances. The unit of energy is the Joule (J). However, when dealing with electricity, we actually use Watts (W). A Watt is a measure of power where 1 Watt is equal to 1 Joule per second. So a 100W light bulb uses 100J of energy every second. An electrical device will have a power rating. This is the amount of electrical energy the device needs to work. We can calculate how much electrical energy a device transfers by multiplying the power rating (W) by the amount of time the device is on for (in hours). The unit of electrical energy transferred is the Watt Hour (Wh). This is likely to be a very large number, so we usually give the number as kilowatt-hours where 1kilowatt hour is equal to 1000 Watt-hours. Let’s look at an example. A computer has a power rating of 250W. If it is used for 6 hours how much energy is transferred to it? Can you substitute the values into our equation? So how much would that cost to use? To work this out we have to know how much a kWh costs. This differs between different countries, different companies within a country, and even different tariffs from the same company. A whole office of computers. The price starts to clock up quite quickly, and that’s before we think about the lights and charging our phones. VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you. These videos can be used in a flipped classroom model or as a revision aid. Access a deeper Learning Experience in the FuseSchool platform and app: www.fuseschool.org This Open Educational Resource is free of charge, under a Creative Commons License: Attribution-NonCommercial CC BY-NC ( View License Deed: http://creativecommons.org/licenses/by-nc/4.0/ ). You are allowed to download the video for nonprofit, educational use. If you would like to modify the video, please contact us: info@fuseschool.org
Not every triangle is a right-angle triangle, so we can't always use Pythagoras and SOHCAHTOA to find missing sides and missing angles. We instead use the sine rule or the cosine rule. They can both be used to find either missing sides or missing angles in any triangle (right angle or not). Click h
Equations are used everywhere: in computers, business, internet searches, medicine to name a few examples. Which is why we study them a lot in Maths. We have names to describe the different parts: coefficients, variables, constants and exponents. A variable is a symbol for a number we don’t know y
To find the equation of a straight line from a graph, you first need to find the gradient and then secondly find the y-intercept. The equation of a straight line is y=mx+c, where m is the gradient and c is the y-intercept. VISIT us at www.fuseschool.org, where all of our videos are carefully org
