We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What Is a Voltage Reduction?

By Geisha A. Legazpi
Updated May 17, 2024
Our promise to you
About Mechanics is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At About Mechanics, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

A voltage reduction is the decrease or action of decreasing the potential difference across electrical load for power conservation or for prolonging equipment life span. It is possible by directly adjusting the voltage output or by inserting a resistive circuit inside a power circuit. A voltage reduction may result in increased current consumption as compensation. Some equipment or appliances will allow a decrease in voltage with no change in current. Motors tend to increase the current consumption when voltage is reduced.

The consumed electrical energy is measured in kilowatt-hour (kW-h), which is equivalent to 1,000 watts (W). Generating equipment is usually specified in terms of kilovolt-amperes (kVA), which is almost the same as watts. The kVA unit measures the rate of energy flow from the power generator, while the kW unit measures the rate of energy absorption by the load. Unabsorbed energy is termed as reactive energy, which only increases the amount of energy needed from the generator but does not produce useful results on the load side. The latter concept is covered by power factor correction equipment.

Voltage reduction is applied in both electric power generation and distribution. Automatic correction of voltage levels results in a steady user-side voltage level. There are step-down transformers from the generating plant, including before and after the power grid. Most of the distribution transformers are fixed to a permanent step-down factor when these equipment were first commissioned into service.

Generally, lighting systems produce almost the same illumination given a range of medium- to high-voltage levels. Lighting voltage reduction takes advantage of the situation by trimming down the voltage. There will be power savings while retaining almost the same amount of illumination.

In electronic circuits, voltage reduction is implemented with resistors, diodes, and transistors. The resistor will have a voltage drop equal to the mathematical product of the current in amperes (A) and the resistance in ohms. For instance, a 10-ohm resistor with 1 A drops 10 volts (V), a silicon diode drops about 0.7 volts direct current (VDC), while five diodes in series drop about 3.5 VDC. Transistor circuits in various configurations may cause voltage reduction. The voltage drop appears between the emitter-collector or drain-source of the transistor.

Voltage reduction equipment is available in many forms and sizes. There are simple step-down transformers wherein there is no electrical connection between the primary and secondary windings, autotransformers or single-winding transformers with a tap, and high-power voltage equipment that delivers specific results. Conservation voltage reduction aims to decrease the amount of power consumed by electrical equipment. Any extra voltage that does not produce significant results is best trimmed down.

About Mechanics is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.

Discussion Comments

About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.

About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.