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2. Telephone magneto - Wikipedia

   en.wikipedia.org/wiki/Telephone_magneto

   A telephone magneto is a hand-cranked electrical generator that uses permanent magnets to produce alternating current from a rotating armature. In early telegraphy , magnetos were used to power instruments, while in telephony they were used to generate electrical current to drive electromechanical ringers in telephone sets and activate signals ...

3. Huge storms are coming this week: Here are 12 things to ... - AOL

   www.aol.com/lifestyle/here-are-12-things-to-have...

   Sometimes power outages can be caused by severe weather conditions, and a hand crank radio can be a last-ditch essential in emergencies. For around $20, the heavy-duty 2000mAh battery can charge ...

4. Human power - Wikipedia

   en.wikipedia.org/wiki/Human_power

   The original Baygen clockwork radio with crank in winding position. A windup radio or clockwork radio is a radio that is powered by human muscle power rather than batteries or the electrical grid. In the most common arrangement, an internal electric generator is run by a mainspring, which is wound by a hand crank on the case. Turning the crank ...

5. Magneto - Wikipedia

   en.wikipedia.org/wiki/Magneto

   Demonstration hand-cranked magneto made circa 1925, on display at the Musée d'histoire des sciences de la Ville de Genève. 2kW Société de l'Alliance magneto generator for arc lamps, of around 1870. A magneto is an electrical generator that uses permanent magnets to produce periodic pulses of alternating current.

6. Emergency radio - Wikipedia

   en.wikipedia.org/wiki/Emergency_radio

   Commonly, such radios are designed to use minimal battery power, and a common feature (especially on units sold in less-developed countries where electrical supplies may be unreliable or nonexistent) is a hand-cranked electrical generator along with a rechargeable battery to store the generated energy (the device is sometimes known as a ...

7. Freeplay Energy - Wikipedia

   en.wikipedia.org/wiki/Freeplay_Energy

   In present Freeplay radios and other products, clockwork mechanisms storing energy in a mainspring have now been replaced by small batteries charged by cheaper hand-crank generators. [9] Freeplay Energy produces a variety of consumer devices in addition to radios, including flashlights, lanterns, mobile phone chargers, and foot-powered generators.