Abstract: Provided are an apparatus and method for measuring humidity of an object to be dried in a dryer. The apparatus for measuring the humidity for the dryer includes a capacitance measuring sensor configured to measure an amount of capacitance change that is changed due to humidity of an object to be dried, which is put into the dryer; a shield configured to shield noise generated in the dryer; and a processor electrically connected to the capacitance measuring sensor and the shield, wherein the processor is configured to apply a second signal having the same waveform and the same voltage to the capacitance measuring sensor and the shield and acquire the amount of capacitance change, based on the first signal output from the capacitance measuring sensor so as to measure an amount of humidity change of the object to be dried.

Abstract: Disclosed is an energy harvesting device. An energy harvesting device according to the present invention includes a first electrode, a second electrode disposed so as to face the first electrode, a first fluid, a magnetic second fluid, a chamber including a dielectric film arranged between the second electrode and the first fluid, and a magnet arranged outside the chamber for moving the second fluid.