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An ampere-hour or amp-hour (symbol: A⋅h or A h; often simplified as Ah) is a unit of electric charge, having dimensions of electric current multiplied by time, equal to the charge transferred by a steady current of one ampere flowing for one hour, or 3,600 coulombs. [1] [2] The commonly seen milliampere-hour (symbol: mA⋅h, mA h, often ...
The amplifier was reissued for the first time in 1988 (the 1959S), and again from 1991 to 1993 (the 1959X) and from 1993 to 1995 (the 1959SLP). [1] The SLP continued after 1995 but in 2000 Marshall added modifications to lower the noise floor (hum balance pot), reverted the negative feedback resistor to the 1968-69 value of 47 kΩ, and added an effects loop.
Voltage: The amp's power supply voltage limits the maximum amplitude of the waveform it can output. This determines the peak momentary output power for a given load resistance. [1] [2] Current: The amp's output devices (transistors or tubes) have a current limit, above which they are damaged.
A Yamaha B100-115 combo amp, which contains a 100 watt amplifier and one 15" speaker in a wooden cabinet. A Hartke 500 watt amp "head" on top of an Ashdown 4x10" speaker cabinet. A bass amplifier (also abbreviated to bass amp ) is a musical instrument electronic device that uses electrical power to make lower-pitched instruments such as the ...
The Marshall Major (Model 1967 [1]) was a bass guitar amplifier made by Marshall. It was introduced in 1967 as the "Marshall 200" (in reference to the power of the amplifier). It had a plexi panel and two inputs in one channel, but in contrast with the 100 watt heads made by Marshall, the first series had split tone controls similar to the ...
For example, when a light bulb with a power rating of 100 W is turned on for one hour, the energy used is 100 watt hours (W·h), 0.1 kilowatt hour, or 360 kJ. This same amount of energy would light a 40-watt bulb for 2.5 hours, or a 50-watt bulb for 2 hours.
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In the International System of Units (SI), electric current is expressed in units of ampere (sometimes called an "amp", symbol A), which is equivalent to one coulomb per second. The ampere is an SI base unit and electric current is a base quantity in the International System of Quantities (ISQ).