Current can be induced when flux changes. Flux is equal to (magnetic field)(area )(cos of angle between the magnetic field and area vectors). Induced current can be very helpful, and some devices use induced current rather than current from a voltage source like a battery. When the tsunami warning forced Hawaii into a frenzy, my mom quickly pulled out our for-emergencies-hand-crank-flashlight and kept it close at hand the whole night. Rather than relying on batteries, this flashlight requires you to crank the handle, which powers the flashlight. These devices are crucial at times in which we may lack resources.
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