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Franck-Hertz Experiment - NUS Physics Department
Franck-Hertz Experiment - NUS Physics Department

... Niels Bohr introduced the planetary model of the atom in 1913. According to Bohr’s model, an isolated atom consists of a positively charged nucleus about which electrons are distributed in successive orbits. He also postulated that only those orbits are possible for electrons for which their angular ...
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High Performance Resonant Mode Controller

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doc Lecture 5 practice Questions
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Current-Limited, Power-Distribution Switches
Current-Limited, Power-Distribution Switches

< 1 ... 1100 1101 1102 1103 1104 1105 1106 1107 1108 ... 1974 >

Mains electricity



Mains electricity is the general-purpose alternating-current (AC) electric power supply. In the US, electric power is referred to by several names including household power, household electricity, house current, powerline, domestic power, wall power, line power, AC power, city power, street power, and grid power.The two principal properties of the electric power supply, voltage and frequency, differ between regions. A voltage of (nominally) 230 V and a frequency of 50 Hz is used in Europe, most of Asia, most of South America and Australia. In North America, the most common combination is 120 V and a frequency of 60 Hz. Other voltages exist, and some countries may have, for example, 230 V but 60 Hz. This is a concern to travelers, since portable appliances designed for one voltage and frequency combination may not operate or may be destroyed by another.The use of different plugs and sockets in different regions provides some protection from accidental use of appliances with incompatible voltage and frequency requirements.
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