A measuring instrument is a device that measures the amount of electrical energy it contains.
For most microphones, a measurement instrument is the electrical input that feeds into the microphone.
In contrast, the watt, or electrical current, of a speaker is measured in watts, or the amount that is transmitted through a wire.
A speaker emits a particular amount of power when it is struck by an object or is in contact with a surface.
If the watt of a measurement source is greater than or equal to the current of a measuring instrument, the microphone will emit a very small amount of current, or a very large amount of sound energy.
For example, if a microphone produces a current of 500 mA, the speaker will emit 500 mW of sound, or only 4% of the current from the microphone that would otherwise be emitted.
In this way, the number of watts a microphone can emit is determined by how much current the speaker generates.
If a speaker emits less current than the speaker does, the measurement instrument emits less wattage than it would if it were in contact, and it emits less sound energy than if the speaker were standing still.
Measurement instruments are commonly used to measure electrical conductivity, electrical resistance, impedance, and the electrical properties of materials such as rubber, plastics, metals, and glass.
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