Final answer:
The unit of power is called the watt. Fundamental units are the units in which the most fundamental physical quantities are measured, while derived units are obtained by combining fundamental units mathematically. Two differences between the CGS and MKS systems include the choice of length unit and the choice of mass unit. The advantages of the SI system include simplicity, consistency, and widespread use. The three requirements for selecting a unit of a physical quantity are that it should be well-defined, reproducible, and convenient to use.
Step-by-step explanation:
The unit of power is called the watt. It is named after James Watt, the Scottish engineer who made important contributions to the development of the steam engine.
Fundamental units are the units in which the most fundamental physical quantities are measured. In the SI (International System of Units), the fundamental units are length (meter), mass (kilogram), time (second), and electric current (ampere). Derived units are units that are obtained by combining fundamental units mathematically, such as speed which is derived from dividing length by time.
The CGS (Centimeter-Gram-Second) system is an older metric system that uses centimeters, grams, and seconds as its fundamental units. The MKS (Meter-Kilogram-Second) system is a more modern metric system that uses meters, kilograms, and seconds as its fundamental units. Two differences between the CGS and MKS systems include the choice of length unit (centimeter vs meter) and the choice of mass unit (gram vs kilogram).
The advantages of the SI system of measurement include its simplicity and consistency, as well as its widespread use and international acceptance. The SI system is based on decimal multiples and submultiples of the fundamental units, making it easy to convert between different units and perform calculations. It also provides a unified and standardized approach to measurement, allowing for easy comparison of physical quantities.
The three requirements for selecting a unit of a physical quantity are that it should be well-defined, reproducible, and convenient to use. The unit should have a clear and unambiguous definition that can be easily understood and replicated. It should also be practical and convenient for everyday use, taking into account factors such as scale, precision, and ease of measurement.