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Electromagnet notes
Electromagnet notes

... Magnetism and Electricity When electric current flows through a wire, a ___________________ forms around the wire. ...


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Electricity

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Compare the voltage drop across resistors connected in series

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Be the source: Deliverying current electricity
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... across 3 phases. If we use conductors in bundles, rather than singles, we can substantially increase the current a line can transmit. If the resistance of the cable is 0.1 Ohm per kilometre the voltage drop for each kilometre is 1000 A x 0.11 or 100 V. The energy dissipated per kilometre is 1000 A x ...
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< 1 ... 1998 1999 2000 2001 2002 2003 2004 2005 2006 ... 2014 >

Alternating current



Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.AC is the form in which electric power is delivered to businesses and residences. The usual waveform of alternating current in most electric power circuits is a sine wave. In certain applications, different waveforms are used, such as triangular or square waves. Audio and radio signals carried on electrical wires are also examples of alternating current. These types of alternating current carry information encoded (or modulated) onto the AC signal, such as sound (audio) or images (video).
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