O LEVEL PHYSICS (5054) PHYSICAL QUANTITES, UNITS AND MEASURING INSTRUMENTS
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Course
Physics
Institution
5
Book
Classical Physics of Matter
This document contains the complete and well-written concepts of the first chapter of O LEVEL PHYSICS (5054) which is PHYSICAL QUANTITIES, UNITS, AND MEASUREMENTS.
Physical Quantities, Units and
Measurements
Sub Topics:
1. Physical Quantity
2. SI units
3. Base Units
4. Derived Units
5. Prefix
6. Scalar and Vector
7. Measuring Instruments
Physical Quantity:
A quantity which can be measured and expressed in
numbers. For example
1. Mass
2. Time
3. Temperature
4. Volume
5. Distance
6. Current
SI Unit:
A SI unit is needed to express a physical quantity.
There are two kinds of SI units
1. Base SI unit
, 2. Derived SI unit
Base SI unit:
One of a set of fundamental units in a system of
measurement that is based on a natural phenomenon or
established standard and from which other units may be
derived.
S# Base Quantity Base SI unit Symbol
1. Length (l) meter m
2. Mass (m) kilogram Kg
3. Time (t) second s
4. Temperature kelvin K
(T)
5. Electric Ampere A
current (I)
Derived SI units:
A derived unit is a unit that results from a mathematical
combination of SI base units. For example:
SI unit of Force is newton (N)
SI unit of Pressure is pascal (Pa)
SI unit of Work is joule (J)
SI unit of Power is watt (W)
SI unit of Charge is coulomb (C)
SI unit of potential difference is Volt (V)
And so, on
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