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electromagnets - School Science
electromagnets - School Science

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... The particular torque-speed characteristic curve and the ease with which the speed itself can be regulated have led to the use of d.c. motors in the field of electric traction. Direct current supply gives also the great advantage of having the contact line consisting of a single conductor since the ...
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... electricity generation, namely: 1) A closed coil, and 2) A changing magnetic field inside the closed coil (through the movement of the magnet inside the coil). If you use an oscilloscope to measure the current induced in the coil, you would see the picture to the right. As a group, discuss the reaso ...
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... Case 1: v1 = 0V The voltage drop across the diode is v1 = 0V, and the diode is turned off (an open circuit). Also, i11 = 0A. Case 2: v1 = VS, where VS > 0V The voltage drop across the diode is v1 = VS, and the diode is turned off (an open circuit). Also, i11 = VS/R11. Case 3: At t = 0-, v1 = VS, whe ...
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Induction heater

An induction heater is a key piece of equipment used in all forms of induction heating. Typically an induction heater operates at either medium frequency (MF) or radio frequency (RF) ranges.Four main component systems form the basis of a modern induction heater the control system, control panel, or ON / OFF switch; in some cases this system can be absent the power unit (power inverter) the work head (transformer) and the heating coil (inductor) How it worksInduction heating is a non contact method of heating a conductive body by utilising a strong magnetic field. Supply (mains) frequency 50 Hz or 60 Hz induction heaters incorporate a coil directly fed from the electricity supply, typically for lower power industrial applications where lower surface temperatures are required. Some specialist induction heaters operate at 400 Hz, the Aerospace power frequency. Induction heating should not be confused with induction cooking, as the two heating systems are mostly very physically different from each other. Notably, induction heating (aka forging) systems work with long metallic rods and sheets to bring them up to temperatures as high as ~2500c for work to be done on them.
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