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Electromagnetic Induction

Electromagnetic Induction. Induced Current: Loop of wire -Moved in a magnetic field a voltage is induced in the wire. V oltage = induced voltage + the resulting current = induced current . Induction = Electromagnetic induction . Current is induced in a coil of wire moved

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Electromagnetic Induction

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  1. Electromagnetic Induction

  2. Induced Current: • Loop of wire -Moved in a magnetic field a voltage is induced in the wire. • Voltage = induced voltage + the resulting current = induced current. • Induction = Electromagnetic induction. Current is induced in a coil of wire moved through a magnetic field. Direction depends on the direction of motion.

  3. The magnitude of the induced voltage is proportional to: • # of wire loops cutting across the magnetic field lines. • Strength of the magnetic field. • Rate at which magnetic field lines are cut by the wire. • Applications: • DC and AC Generators, • Transformers (step-up and step-down).

  4. AC vs. DC Current • ­ Direct current (DC)- The positive and negative terminals of a battery are always, respectively, positive ­and negative. • Current always flows in the same direction between the terminals. • Batteries, fuel cells and solar cells • Alternating current (AC)- The direction of the current reverses, or alternates, 60 times per second (in the U.S.) or 50 times per second (in Europe, for example). • Power that is available at a wall socket in the United States is 120-volt, 60-cycle AC power. • Power plant

  5. Power companies convert alternating current to very high voltages for transmission then drop it back down to lower voltages for distribution inside the house for safety. • 1 million volts to1,000 volts and finally down to 120 volts • It's a lot harder to kill someone with 120 volts than with 1 million volts

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