National Physical Therapy Examination (NPTE) Practice Exam

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What is the standard unit of measure for the phase charge of a monophasic waveform?

Watt
Ampere
Ohm
Coulomb

The correct answer is: Coulomb

The standard unit of measure for the phase charge of a monophasic waveform is the Coulomb. In electrical terms, a monophasic waveform typically refers to a single-phase alternating current (AC) supply, which is characterized by its sinusoidal waveform. The charge in an electrical context refers to the quantity of electricity that is carried by the current. The Coulomb is defined as the amount of electric charge transferred by a steady current of one ampere in one second. This unit is fundamental in electrostatics and is part of the International System of Units (SI). In contrast, options like Watts, Amperes, and Ohms represent different electrical quantities. Watts measure power (the rate of energy transfer), Amperes measure electric current (the flow of charge), and Ohms measure resistance (the opposition to current flow). Therefore, the Coulomb stands out as the appropriate unit for quantifying phase charge, as it specifically addresses the amount of electric charge involved in electrical phenomena.