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Public address systems consist of input sources (microphones, sound playback devices, etc.), amplifiers, control and monitoring equipment (e.g., LED indicator lights, VU meters, headphones), and loudspeakers. Usual input include microphones for speech or singing, direct inputs from musical instruments, and a recorded sound playback device. In ...
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Of 2010 world total lighting sales, 50 to 70 percent were incandescent. [42] Replacing all inefficient lighting with CFLs would save 409 terawatt-hours (1.47 exajoules) per year, 2.5% of world electricity use. In the US, it is estimated that replacing all incandescents would save 80 TWh yearly. [43]
A popular choice for the latter is the NEMA 14-50 receptacle. This type of outlet provides 240 volts and, when wired to a 50-ampere circuit, can support charging at 40 amperes according to North American electrical code. This translates to a power supply of up to 9.6 kilowatts, [91] offering a faster and more efficient charging experience.
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In the US, Canada, Japan, and other countries with 120 V electricity, a normal household outlet delivers 1.5 kilowatts. In other countries with 230 V electricity between 7 and 14 kilowatts can be delivered (230 V single phase and 400 V three-phase, respectively).
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