{"product_id":"ohm-s-law-power-formulas-slate-coaster","title":"Ohm’s Law Power Formulas Slate Coaster","description":"\u003cp\u003eA practical and eye-catching slate coaster for radio enthusiasts, laser engraved with essential \u003cstrong\u003eOhm’s Law and power formulas\u003c\/strong\u003e: \u003cstrong\u003eV = I × R\u003c\/strong\u003e, \u003cstrong\u003eP = V × I\u003c\/strong\u003e, \u003cstrong\u003eP = V² ÷ R\u003c\/strong\u003e, and \u003cstrong\u003eP = I² × R\u003c\/strong\u003e. These formulas describe the relationship between voltage, current, resistance, and power — the core electrical principles behind transmitters, receivers, antennas, power supplies, dummy loads, and test equipment.\u003c\/p\u003e\n\u003cp\u003eFor ham radio operators and short wave listeners, these calculations are genuinely useful at the bench or in the shack. They help when checking current draw, estimating power dissipation, choosing suitable resistors, understanding dummy loads, or working out whether equipment and cables are being operated safely. Laser engraved into natural slate, this coaster combines a rugged technical look with a handy reference that feels right at home beside a transceiver, soldering station, or workshop mug.\u003c\/p\u003e\n\u003cp\u003eThese coasters are supplied with four soft adhesive feet so they do not mark surfaces. Putting four or six together would make an ideal gift.\u003c\/p\u003e\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePrecision laser engraved design\u003c\/li\u003e\n\u003cli\u003eCrafted from natural grey slate\u003c\/li\u003e\n\u003cli\u003e10cm diameter and 4mm thick slate coaster with a rustic bevelled edge\u003c\/li\u003e\n\u003cli\u003eSoft sponge feet included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePlease note slate coasters are not dishwasher safe.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003eDesign Copyright Notice\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAll designs are the intellectual property of Primary 9 Designs and are protected by copyright.\u003c\/p\u003e\n\u003cp\u003eThese products are supplied for\u003cstrong\u003e \u003c\/strong\u003epersonal use only. The designs may not be reproduced, copied, distributed, modified, or used to create products for resale without prior written permission from Primary 9 Designs.\u003c\/p\u003e\n\u003cp\u003ePurchase of this item does not transfer copyright or grant a commercial licence to reproduce or sell the design in any form.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003eLarge Orders\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLooking to order larger quantities? We are happy to provide bespoke lead time and shipping quotations for bulk orders, schools, clubs, care homes, events and organisations. Please contact us and we'll help find the most cost-effective shipping option for your order.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Primary 9 Designs","offers":[{"title":"Default Title","offer_id":58373153718617,"sku":"4SLT10CR-OHM","price":4.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/9230\/3961\/files\/IMG_3291.jpg?v=1782138568","url":"https:\/\/primary9designs.com\/products\/ohm-s-law-power-formulas-slate-coaster","provider":"Primary 9 Designs","version":"1.0","type":"link"}