They also have it per kilofeet or feet. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How to calculate voltage drop over and power loss in wires Ask Question.
Asked 8 years, 8 months ago. Active 5 years, 8 months ago. Viewed k times. They have a very low resistance so the maximum current is relatively large. For further information about current rating please see the cables page. The standard unit for energy is the joule J , but 1J is a very small amount of energy for mains electricity so kilojoule kJ or megajoule MJ are sometimes used in scientific work. In the home we measure electrical energy in kilowatt-hours kWh , often just called a 'unit' of electricity when the context is clear.
This would break the law of conservation of energy. Devices waste energy for various reasons including friction between their moving parts, electrical resistance, and unwanted sound energy. Devices can be made more efficient by reducing the energy that they waste or dissipate to the surroundings.
One example is lubrication being used to reduce the friction between moving parts of a machine. Efficiency Devices are designed to waste as little energy as possible. Example The energy supplied to a light bulb is J. The less efficient the engine is, the more fuel it needs to cover the same distance. Embed Share via. Efficiency Calculator By Bogna Szyk. Table of contents: What is efficiency? How to calculate efficiency? Real-life applications. What is efficiency? Real-life applications Even though you probably don't notice it, we apply the definition of efficiency to other real-life phenomena.
Energy input.
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