Session 11 Measurement of Resistance Inductance and Capacitance

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Session 11 Measurement of Resistance, Inductance and Capacitance ü Resistance Ø Property of Resistance

Session 11 Measurement of Resistance, Inductance and Capacitance ü Resistance Ø Property of Resistance Ø Unit of resistance Ø Classification of resistance Ø Methods of measurement of resistance ü Inductance Ø Property of Inductance Ø Unit of inductance Ø Classification of Inductance Ø Methods of measurement of inductance ü Capacitance Ø Property of capacitance Ø Unit of Capacitance Ø Methods of measurement of capacitance

Resistance (R): A property of a conductor by virtue of which the passage of

Resistance (R): A property of a conductor by virtue of which the passage of current is opposed, causing electric energy to be transformed into heat: equal to the voltage across the conductor divided by the current flowing in the conductor Unit of Resistance: Measured in ohm Symbol - Ω Classification of Resistance: Ø Low resistance - Less than 1Ω Ø Medium resistance - 1Ω - 0. 1 MΩ Ø High resistance - Greater than 0. 1 MΩ

Methods of measurement of resistance Ø Low Resistance: ü Kelvin Double bridge method Ø

Methods of measurement of resistance Ø Low Resistance: ü Kelvin Double bridge method Ø Medium Resistance: ü Ammeter-Voltmeter method ü Substitution method ü Wheatstone bridge method Ø High Resistance: ü Direct deflection method ü Loss of charge method ü Meggar

Inductance (L): If a changing flux is linked with a coil of a conductor

Inductance (L): If a changing flux is linked with a coil of a conductor there would be an emf induced in it. The property of the coil of inducing emf due to the changing flux linked with it is known as inductance of the coil. Due to this property all electrical coil can be referred as inductor. In other way, an inductor can be defined as an energy storage device which stores energy in form of magnetic field. Unit of Inductance: Measured in henry Symbol - H Classification of Inductance: Ø Self Inductance Ø Mutual Inductance

Methods of measurement of Inductance Ø Self Inductance: ü Maxwell's Inductance Bridge ü Hay’s

Methods of measurement of Inductance Ø Self Inductance: ü Maxwell's Inductance Bridge ü Hay’s Bridge ü Owen’s Bridge Ø Mutual Inductance: ü Campbell’s Bridge ü Heaviside Mutual Inductance Bridge

Capacitance (C): Capacitance is the ability of a body to store an electric charge

Capacitance (C): Capacitance is the ability of a body to store an electric charge or The capability to hold an electric charge is known as capacitance or The capacitance, C, of a capacitor is defined as the ratio of the magnitude of the charge on either conductor to the potential difference between the conductors C = Q/V Unit of Capacitance: Measured in farad Symbol - F Methods of measurement of Capacitance: Ø De Sauty’s Bridge Ø Schering Bridge

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