VOLTAGE DROP AND CABLE RESISTANCE EXAM PRACTICE – PRACTICE QUESTIONS AND FULLY WORKED ANSWERS

In this LearnElectrics video, we take a look at calculating voltage drop in cables and also the resistance of cables in circuits and which formulas to use to calculate the answers. The formulas are not the same for the resistance and voltage drop, they are not same thing, even though they have several symbols in common. Each of the formulas has its own special place in our work, and in the exams and assessments. These types of questions will always come up in electrical exams and in the inspection and test assessments. You need to know how to use them, how to recognise and use the correct formula and which tables should be used with which formula. We’ve had several questions posted to us where a little confusion has existed over which formula to use and which table to use. Get them the wrong way round and the answers will be wrong. We are frequently asked … What are the formulas, how do I calculate voltage drop, which tables do I use, and much more. We will begin with the resistance formula and calculating R1+R2, and which tables to use. Next, we look at the voltage drop formula and the relevant tables for this. Then we will show each formula in use with guided questions and answers. And we will show you how to rearrange the formula and work the calculation backwards. Each question is fully worked out for you, so that you totally understand how to make the calculations, and we show you where in the tables to find the data that you need. This is video number 242 and to view all our videos type in LearnElectrics all one word into the YouTube search bar. Visit our YouTube channel where we have many more videos on a wide range of electrical topics.