Search results
Results from the WOW.Com Content Network
Ohm's law states that the electric current through a conductor is proportional to the voltage across it, with a constant of proportionality called resistance. The law was named after Georg Ohm, who published his experimental results in 1827 and explained them with a model of internal resistance.
Volt-ampere (VA) is the unit of apparent power in an electrical circuit, equal to the product of root mean square voltage and current. Learn how VA differs from real power (watts) and reactive power (var), and how it is used for generators, transformers and UPSs.
A watt is the SI unit of power or radiant flux, equal to 1 joule per second or 1 kg⋅m 2 ⋅s −3. It is named after James Watt, an 18th-century inventor who improved the steam engine. Learn how to calculate watt, see examples, and explore its multiples and submultiples.
Voltage, also known as (electrical) potential difference, electric pressure, or electric tension is the difference in electric potential between two points. [1] [2] In a static electric field, it corresponds to the work needed per unit of charge to move a positive test charge from the first point to the second point.
Electrical energy is energy related to forces on electrically charged particles and the movement of those particles (often electrons in wires, but not always). This energy is supplied by the combination of current and electric potential (often referred to as voltage because electric potential is measured in volts) that is delivered by a circuit (e.g., provided by an electric power utility).
Learn how electric power is the rate of transfer of electrical energy within a circuit, and how it is measured in watts. Find out the formula for electric power in terms of current, voltage and resistance, and see how it applies to resistive, inductive and capacitive circuits.
The ampere (symbol: A) is the unit of electric current in the International System of Units (SI), equal to one coulomb per second. It is named after André-Marie Ampère, a French physicist who studied electromagnetism, and defined by fixing the elementary charge e to be exactly 1.602 176 634 × 10−19 C.
Learn about different types of power amplifiers and their characteristics, such as class AB, which is a compromise between class A and class B for audio applications. Compare class AB with other classes, such as class C, D, E, and F, and their advantages and disadvantages.