Headphones Help!!!!!!!!!?

Question

what is
dB
Hz
Ohms
mW
kHz

Answer 1

The decibel (dB) is a logarithmic unit of measurement that expresses the magnitude of a physical quantity (usually power or intensity) relative to a specified or implied reference level. Its logarithmic nature allows very large or very small ratios to be represented by a convenient number, in a similar manner to scientific notation. Since it expresses a ratio of two quantities, it is a dimensionless unit.

The hertz (symbol: Hz) is the International System of Units (SI) base unit of frequency. Its base unit is cycle/s or s-1 (also called inverse seconds, reciprocal seconds). In English, hertz is used as both singular and plural. As any SI unit, Hz can be prefixed; commonly used multiples are kHz (kilohertz, 103 Hz), MHz (megahertz, 106 Hz), GHz (gigahertz, 109 Hz) and THz (terahertz, 1012 Hz).

One hertz simply means one cycle per second (typically that which is being counted is a complete cycle); 100 Hz means one hundred cycles per second, and so on. The unit may be applied to any periodic event—for example, a clock might be said to tick at 1 Hz, or a human heart might be said to beat at 1.2 Hz. The frequencies of aperiodic events, such as radioactive decay, are expressed in becquerels.

To avoid confusion, periodically varying angles are typically not expressed in hertz, but rather in an appropriate angular unit such as radians per second. A disc rotating at 1 revolution per minute (RPM) can thus be said to be rotating at 0.105 rad/s or 0.017 Hz, where the latter reflects the number of complete revolutions per second. The conversion between Hz and rad/s is rad/s = 1 Hz × 2 .

An ohm is the electrical resistance offered by a current-carrying element that produces a voltage drop of one volt when a current of one ampere is flowing through it.

The megawatt (symbol: MW) is equal to one million (106) watts.

Many things can sustain the transfer or consumption of energy on this scale; some of these events or entities include: lightning strikes, large electric motors, naval craft (such as aircraft carriers and submarines), engineering hardware, and some scientific research equipment (such as the supercollider and large lasers). A large residential or retail building may consume several megawatts in electric power and heating energy.

The hertz (symbol: Hz) is the International System of Units (SI) base unit of frequency. Its base unit is cycle/s or s-1 (also called inverse seconds, reciprocal seconds). In English, hertz is used as both singular and plural. As any SI unit, Hz can be prefixed; commonly used multiples are kHz (kilohertz, 103 Hz), MHz (megahertz, 106 Hz), GHz (gigahertz, 109 Hz) and THz (terahertz, 1012 Hz).

Answer 2

dB = decibel - it's a measurement of the sound-pressure level (loudness) that the headphones produce - it's not an absolute measurement, but rather a logarithmic ratio - a +3 dB difference is double the sound pressure level, while a +10 dB difference is 10 times the sound pressure level, and a +20 dB difference is 100 times the sound pressure level

Hz = Hertz, or cycles per second - it's a measurement of the frequency response of the headphones (what frequencies it will reproduce) - the range of human hearing is from about 20 Hz to 20,000 Hz

Ohms = a measurement of the impedance (resistance to alternating current) that the headphones add to the output of the amplifier circuit - The impedance of headphones is generally higher than loudspeakers, so they use relatively low current and don't heat up

mW = Milliwatt (one thousandth of a watt) - this is a measure of the amount of electrical power that is coming out of the amplifier to drive the headphones

kHz = kilohertz or 1000 hertz - the range of human hearing is 20 Hz to 20 kHz