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2. Digital-to-analog converter - Wikipedia

   en.wikipedia.org/wiki/Digital-to-analog_converter

   8-channel Cirrus Logic CS4382 digital-to-analog converter as used in a sound card. In electronics, a digital-to-analog converter ( DAC, D/A, D2A, or D-to-A) is a system that converts a digital signal into an analog signal. An analog-to-digital converter (ADC) performs the reverse function. There are several DAC architectures; the suitability of ...

3. Energy conversion efficiency - Wikipedia

   en.wikipedia.org/wiki/Energy_conversion_efficiency

   Energy conversion efficiency ( η) is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The input, as well as the useful output may be chemical, electric power, mechanical work, light (radiation), or heat. The resulting value, η (eta), ranges between 0 and 1. [ 1][ 2][ 3]

4. DC-to-DC converter - Wikipedia

   en.wikipedia.org/wiki/DC-to-DC_converter

   v. t. e. A DC-to-DC converter is an electronic circuit or electromechanical device that converts a source of direct current (DC) from one voltage level to another. It is a type of electric power converter. Power levels range from very low (small batteries) to very high (high-voltage power transmission).

5. TikTok - Wikipedia

   en.wikipedia.org/wiki/TikTok

   TikTok, whose mainland Chinese counterpart is Douyin, [ a][ 3] is a short-form video hosting service owned by Chinese internet company ByteDance. It hosts user-submitted videos, which can range in duration from three seconds to 60 minutes. [ 4] It can be accessed with a smartphone app .

6. Huntington's disease - Wikipedia

   en.wikipedia.org/wiki/Huntington's_disease

   Huntington's disease. Huntington's disease ( HD ), also known as Huntington's chorea, is an incurable neurodegenerative disease [ 7] that is mostly inherited. [ 8] The earliest symptoms are often subtle problems with mood or mental/psychiatric abilities. [ 9][ 1] A general lack of coordination and an unsteady gait often follow. [ 2]

7. Urea - Wikipedia

   en.wikipedia.org/wiki/Urea

   The structure of the molecule of urea is O=C(−NH 2) 2.The urea molecule is planar when in a solid crystal because of sp 2 hybridization of the N orbitals. [8] [9] It is non-planar with C 2 symmetry when in the gas phase [10] or in aqueous solution, [9] with C–N–H and H–N–H bond angles that are intermediate between the trigonal planar angle of 120° and the tetrahedral angle of 109.5°.