[Construction Section 55]
3. ENERGY
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Electricity
Electric power is the name for a directed movement of cargo carriers, such as electrons or ions, in a substance or in a vacuum. Dormant cargo carrier by different forces can be set into motion, in important cases, the Coulomb or Lorentz power. Once in motion, the charge carriers in field free premises itself. An example is the electron motion in an electron tube.
In general, electric power and electricity. Sometimes, in order to transfer or measurement of electrical energy intentioned, but physically not correct. Also, the physical size of the current intensity, the flowing time per charge, generally referred to colloquially as electricity.
The formula characters for the time constant electric current strength is I. The time-amperage is also known as i or i (t). Measure the current intensity in amperes, named after the French physicist and mathematician Andre Marie Ampere. The unit is the symbol of A. It is the Ampere SI base unit.
Measurement of the electrical current:
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The electrical current can flow directly with a knife measured. Today, the measurement usually with a digital millimetre made, which is next to an electricity meter still a voltage meter for measuring electrical voltage, and the measurement of electrical resistance.
For the measurement of very large flows to measure the voltage across a measuring resistance. In alternating currents of about 10 A also come up electricity transformers are used. To uninterrupted measurement audit work suitable gun Ammeter.