The document discusses fundamental and derived units in the International System of Units (SI). It outlines that there are 7 fundamental SI units including the meter, kilogram, second, ampere, kelvin, candela, and mole. Derived units are formed from combinations of the fundamental units and are used for measurements not based on the fundamental units. Examples of derived unit groups include mechanical, electrical, and magnetic units such as hertz, coulomb, farad, watt, and volt.

2. Fundamental & Derived Units

3. Fundamental & Derived Units
Systeme Internationale (SI)
7 SI Fundamental Units
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4. Fundamental SI units
Fundamental Unit: Measured In:
Length l Meter m
Mass m Kilogram kg
Time t Second s
Current I Ampere A
Temperature T Kelvin K
Luminous Intensity I Candela cd
Amount of Substance
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Mole mol

5. SI Derived units
★ Basic Units are not sufficient for all situations
of measurement
★Derived units are for non-basic situations
★Derived Units use: length, mass and time
(various combinations)
★Derived Unit Groups: Mechanical, electrical,
magnetic
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6. Derived Mechanical
Units
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7. Derived Electrical
Units
Frequency f Hertz Hz
Charge Q Coulomb C
Capacitance C Farad F
Power P Watt W
Potential V 7
Volt V