And whatever you do, do not buy a kit to make your own test instrument. As such, a quality test instrument is much more important than the usual former RadioShack novelty toy, piece of wiring, batteries, etc. What a test instrument tells you will in turn result in critical decisions. When it comes to test instruments, skip the cheap ones. Once the number of ohms are known, more of the templates and formulas can be used when the usual volt/amp/watt amounts aren't available. For the purposes of this page, it is usually needed to find the resistance. The usual VOM can measure AC and DC voltage, current in milliamps, and resistance in ohms and megohms. VOM is the acronym for Volt Ohm Milliammeter, More specifically, it is known as a multimeter or a multitester. What Is a VOM ( Electronics Definition ) And Some General Notes. If an algebra explanation is desired, here is a Basic Algebra Tutorial. Hopefully, between the appliance specifications plate, manual(s), and the above math you will be able to find the answer to your question. Thanks to the laws of physics whether it be trying to calculate how many amps, watts, ohms, or volts Ohm's law and it's derivatives will always provide three different, possible ways for finding the answer. Simply select the one in the template table of contents specifically addressing that which you you wish to find. There are four, independent, separate tutorials on this page. This is a large file, if you do make a selection it may take a few seconds to display the appropriate section.Ĭalculate how many WATTS from volts, amps, ohms ( examples). With any luck, you will find one you can use and won't have to bother selecting the related title for the included lessons and examples. Here is a list of formulas and templates. It uses and/or what its internal resistance in ohms will be.Ĭomprehensive List of Ohm's Law Formulas and Examples House voltage is 120 volts, then you can easily calculate how many amps As an example, if it tells you it consumes 200 watts and you know your If you happen to have the manual (maybe it is still online?), then you may be lucky indeed. Even if it doesn't provide the outright answer, it will hopefully have enough other information to enable you to calculate the answer from the templates. check to see if there is any sort of specifications label, metal plate, or even just a sticker. If your inquiry concerns a particular appliance, device, etc. No need to memorize, definitions are reprinted as needed. " R" is the industry standard to designate resistance by the unit of measurement, ohms.Īnd that's all there is to it.The industry formula standard used to be "E", but now both "E" and "V" are being used interchangeably. " E" and " V" are both used to designate electromotive-force by the unit of." I" is the industry standard to designate current by the unit of measurement, amps." P" is the industry standard to designate power by the unit of measurement, watts.
Ohm's law and its derivatives uses some basic letters to represent watts, amps, volts, and ohms. In most circumstances, the only math required is multiplication and division. Don't forget the templates and table of contents. This is the place to figure out watts, amps, volts, or ohms from any of the other two by using Ohm's law and its derivatives.
It is guessed you are here to figure out a math answer to a particular electrical or electronics problem.
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