The size of the unit is different in different systems of units.įor example, Kg (kilogram) and g (grams) are two units to measure the mass of an object. So, when we say that the length of a rod is 5 meters then here in this case If $n$ is the numerical value of a physical quantity and $u$ is the size of the unit, then, magnitude $Q$ of physical quantity is Magnitude og physical quantity = numerical value of physical quantity times size of its unit. The numerical value – expresses how many times the above-mentioned unit is contained in the given physical quantity.To express the magnitude of a physical quantity we need to know two things, Those quantities with both magnitude and direction are considered vector quantities. We are clear that scalar quantities are those that have only magnitude by definition. Scalar and vector quantities both use magnitude as a common factor. For example, a motor that generates 100 watts of power is more powerful than a motor that generates 50 watts of power.įinding the magnitude of a physical quantity Power: The magnitude of power is the rate at which energy is transferred or work is done.For example, a potential difference of 6 volts is greater in magnitude than a potential difference of 3 volts. Electric potential difference: The magnitude of electric potential difference is the amount of energy per unit of charge that is transferred between two points in an electric circuit.For example, a current of 1 ampere (A) is greater in magnitude than a current of 0.5 amperes. Electric current: The magnitude of electric current is the flow of electric charge per unit of time.For example, a 100-watt light bulb has a greater energy magnitude than a 60-watt light bulb. Energy: The magnitude of energy is the amount of work that can be done by a force. For example, a force of 5 newtons is greater in magnitude than a force of 2 newtons.
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