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  2. Electric current - Wikipedia

    en.wikipedia.org/wiki/Electric_current

    Electric current can be directly measured with a galvanometer, but this method involves breaking the electrical circuit, which is sometimes inconvenient. Current can also be measured without breaking the circuit by detecting the magnetic field associated with the current. Devices, at the circuit level, use various techniques to measure current:

  3. Sources of electrical energy - Wikipedia

    en.wikipedia.org/wiki/Sources_of_electrical_energy

    The electric field sends the electron to the p-type material, and the hole to the n-type material. If an external current path is provided, electrical energy will be available to do work. The electron flow provides the current, and the cell's electric field creates the voltage. With both current and voltage the silicon cell has power.

  4. Electricity - Wikipedia

    en.wikipedia.org/wiki/Electricity

    Electric current can flow through some things, electrical conductors, but will not flow through an electrical insulator. [ 42 ] By historical convention, a positive current is defined as having the same direction of flow as any positive charge it contains, or to flow from the most positive part of a circuit to the most negative part.

  5. Electricity generation - Wikipedia

    en.wikipedia.org/wiki/Electricity_generation

    Previously the only way to produce electricity was by chemical reactions or using battery cells, and the only practical use of electricity was for the telegraph. Electricity generation at central power stations started in 1882, when a steam engine driving a dynamo at Pearl Street Station produced a DC current that powered public lighting on ...

  6. Direct current - Wikipedia

    en.wikipedia.org/wiki/Direct_current

    This symbol which can be represented with Unicode character U+2393 (⎓) is found on many electronic devices that either require or produce direct current. DC is commonly found in many extra-low voltage applications and some low-voltage applications, especially where these are powered by batteries or solar power systems (since both can produce ...

  7. Electromagnetic induction - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_induction

    A current clamp is a type of transformer with a split core which can be spread apart and clipped onto a wire or coil to either measure the current in it or, in reverse, to induce a voltage. Unlike conventional instruments the clamp does not make electrical contact with the conductor or require it to be disconnected during attachment of the clamp.

  8. 2 Top Electric Vehicle Stocks to Buy in December - AOL

    www.aol.com/2-top-electric-vehicle-stocks...

    Here are two electric vehicle stocks to buy now as the market continues to take shape. ... the company cut costs for its current lineup of vans, R1T trucks, and R1S SUVs by up to 35%, moving it ...

  9. Faraday's law of induction - Wikipedia

    en.wikipedia.org/wiki/Faraday's_law_of_induction

    Faraday's law of induction (or simply Faraday's law) is a law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an electromotive force (emf). This phenomenon, known as electromagnetic induction , is the fundamental operating principle of transformers , inductors , and many types of electric ...