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...
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 supply is one-third to two-thirds of the volt-ampere rating. In fact, the volt-ampere...
10.Whatdoestheunderlinedword“tangible”probably mean? A.Realistic. B.Creative. C.Challenging. D.Temporary. 11.Whatcanbeinferredfromtheresearchfindings? A.Peoplecangetsmartthroughlearning. B.Oneshouldnotdiscriminateotherraces. C.Peopledon?tenjoyequalrightsforeducation. D.Onecanlivelongerbygettingmoreeduca...
What does a photon energy unit of a Joule equal? Is a photon a particle? What is the speed of light in mph? What is the energy of a photon of blue light? What is the speed of light per minute? What if the speed of light was faster?
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A power substation typically does two or three things: It has transformers that "step down" transmission voltages (in the tens or hundreds of thousands of volts range) down to distribution voltages (typically less than 10,000 volts). It has a "bus" that can split the distribution power off...
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...
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] ...
copper has 29 protons in its nucleus and an equal number of electrons orbiting around it. Electrons orbit at varying distances from the nucleus of the atom. Electrons closer to the nucleus feel a much stronger attraction to the center than those in distant orbits. The outermost electrons of an...