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  2. Reed switch - Wikipedia

    en.wikipedia.org/wiki/Reed_switch

    Reed switches can be used to directly switch a variety of loads ranging from nanovolts to kilovolts, femtoamperes to amperes, and DC to radio frequency. Other magnetically-activated switching devices have a limited range of output voltages and currents, and generally do not directly control a final device such as a lamp, solenoid, or motor.

  3. Magnetic switch - Wikipedia

    en.wikipedia.org/wiki/Magnetic_switch

    Magnetic switch. Magnetic switch is an electrical switch that makes or breaks contact in the presence of a magnetic field.Applications include situations where it is not desirable or possible for moving elements to make direct contact with the switch, such as in explosive environments, submerged in liquids, and where repetitive contact with a mechanical switch would result in undesired wear.

  4. Reed relay - Wikipedia

    en.wikipedia.org/wiki/Reed_relay

    A reed relay [i] is a type of relay that uses an electromagnet to control one or more reed switches. The contacts are of magnetic material and the electromagnet acts directly on them without requiring an armature to move them. Sealed in a long, narrow glass tube, the contacts are protected from corrosion. The glass envelope may contain multiple ...

  5. You won't need waves with this $20,000 electric surfboard

    www.engadget.com/2015-05-22-radinn-wakejet...

    Radinn's wakejet is hardly the first product like this, but with the relatively short recharge time and long range, it's probably the most practical -- and expensive! It's on pre-order with a Q2 ...

  6. Magnetic gear - Wikipedia

    en.wikipedia.org/wiki/Magnetic_Gear

    An intermediate ferromagnetic pole "stator" is usually held stationary between the rings, to direct the concentration of the magnetic lines between the high speed rotor and the low speed rotor. The gear ratio between the rotors is the number of magnetic pole pairs on the high speed rotor to the number of magnetic pole pairs on the low speed rotor.

  7. Navier's 30-foot hydrofoiling electric boat hits the water ...

    techcrunch.com/2022/12/07/naviers-30-foot-hydro...

    Now it’s a real 30-foot boat actually plowing through the waves at 25 knots. The craft is fully electric and uses hydrofoiling to get around the fact that batteries, while fine for wheeled ...

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