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Electrical energy
Electrical energy

Electrical energy
Electrical energy

... power lines there is always some loss of energy as heat, due to the resistance of the metal in the wires. If these wires could be made cheaply from superconductors, no energy would be lost and billions of dollars could be saved. The problem was that to produce a superconductor, a temperature of –270 ...
Time evolution of electric fields and currents and the
Time evolution of electric fields and currents and the

... Abstract. Fundamentally, the time derivative of the electric field is given by the displacement-current term in Maxwell’s generalization of Ampère’s law, and the time derivative of the electric current density is given by the generalized Ohm’s law. The latter is derived by summing the accelerations ...
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Class- XII- A Physics- HW

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... 1. The motor spins in the opposite direction when the poles of the magnets are reversed. 2. The motor spins in the opposite direction when the connections to the cells are reversed. Electricity flows through the coil when the wire from one end of the coil is in contact with one of the brushes, and t ...
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... a) Find the divergence of the E field for s>0. b) Calculate the electric flux out of an imaginary "Gaussian" cylinder of length "L", and  yourself: by radius "a" , centered around the z axis. Do this 2 different ways to check direct integration, and using Gauss' law) c) Given parts a and b, what i ...
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Study on Internal Mechanisms of Charge, Current, Electric Field and

... Especially for the classical electromagnetism theory system, which is a very typical phenomenological theory of physics system, has achieved great success and can explain a variety of electromagnetic phenomena. Nevertheless, we are only familiar with the principles, without knowing the exact reason ...
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Electric current



An electric current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in a plasma.The SI unit for measuring an electric current is the ampere, which is the flow of electric charge across a surface at the rate of one coulomb per second. Electric current is measured using a device called an ammeter.Electric currents cause Joule heating, which creates light in incandescent light bulbs. They also create magnetic fields, which are used in motors, inductors and generators.The particles that carry the charge in an electric current are called charge carriers. In metals, one or more electrons from each atom are loosely bound to the atom, and can move freely about within the metal. These conduction electrons are the charge carriers in metal conductors.
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