Ohm’s Law Power Formulas Slate Coaster
Ohm’s Law Power Formulas Slate Coaster
A practical and eye-catching slate coaster for radio enthusiasts, laser engraved with essential Ohm’s Law and power formulas: V = I × R, P = V × I, P = V² ÷ R, and P = I² × R. 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.
For 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.
These coasters are supplied with four soft adhesive feet so they do not mark surfaces. Putting four or six together would make an ideal gift.
Product Features
- Precision laser engraved design
- Crafted from natural grey slate
- 10cm diameter and 4mm thick slate coaster with a rustic bevelled edge
- Soft sponge feet included
Please note slate coasters are not dishwasher safe.
Design Copyright Notice
All designs are the intellectual property of Primary 9 Designs and are protected by copyright.
These products are supplied for personal 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.
Purchase of this item does not transfer copyright or grant a commercial licence to reproduce or sell the design in any form.
Large Orders
Looking 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.
Details
This product is crafted with quality materials to ensure durability and performance. Designed with your convenience in mind, it seamlessly fits into your everyday life.
Shipping & Returns
We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.
We are committed to ensuring a positive shopping experience for all our customers. If for any reason you wish to return an item, we invite you to reach out to our team for assistance, and we will evaluate every return request with care and consideration.
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