A "volt" is a unit of electric potential, also known as electromotive force, and represents "the potential difference between two points of a conducting wire carrying a constant current of 1 ampere, when the power dissipated between these points is equal to 1 watt."[1]Stated another way, a...
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The distinction between watts and volt-amperes can cause confusion when stating power supply specifications. For example, a supply might be rated at 600 VA. This does not mean it can deliver 600 W unless the equipment is reactance-free. In real life, the true wattage rating of a power supp...
Ohms are sometimes expressed inpower-of-10multiples to accommodate large quantities. For example, one kiloohm is equal to 1,000 (103) ohms, and one megaohm is equal to 1,000 kiloohms or 1,000,000 (106) ohms. In addition, ohms can be expressed in smaller quantities, such as the micro...
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What does a Newton measure? newton,absolute unit of forcein the International System of Units (SI units), abbreviated N. It is defined as that force necessary to provide a mass of one kilogram with an acceleration of one metre per second per second. ...
Can the average power be equal to instantaneous power? Define a polarized electrical device. Most electrical appliances are rated in watts. Does this rating depend on how long the appliance is on? (When off, it is a zerowatt device.) Explain in terms of the definition of power. ...
Initially the current is large, because in a sense the charges can not tell immediately that the wire does not really go anywhere, that there is no complete circuit of wire.The initial current is limited by the resistance of the wires, or perhaps by a real resistor. But as charge builds...
Why does kinetic energy equal 1/2mv^2? Differentiate between energy and power. What is mean by kinetic energy? What is difference between electricity and magnetism? What effect does mass have on inertia? What is the difference between potential energy and gravitational potential energy?
athe energy consumed by the magnetic bearings must be low enough so it does not discharge the vehicle's 12-volt batteries when the car is parked and the turbine is off 磁向位消耗的能量必须是足够低,因此它不释放车的12伏特电池,当汽车停放时,并且涡轮关闭[translate] ...