Electrical Instruments

What is Maxwell’s Bridge? Circuit Diagram, Derivation & Advantages

Maxwell’s Bridge method is used for measuring an unknown inductances of low Q values. It measures unknown inductance in terms of known capacitance.  The circuit of Maxwell’s bridge is shown in Fig. 1. One arm of the bridge has resistor R1 in parallel with capacitor C1. The unknown inductor Lx with series resistor Rx is

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What is Permanent Magnet Moving Coil (PMMC) Instrument? Working Principle, Diagram, Construction, Parts and Derivation

Figure 1: PMMC Instrument. Working Principle of PMMC Instrument When a current carrying conductor is placed in a magnetic field the force is produced on the conductor (coil). This force tends to move the coil in the space. Construction of PMMC Instrument Fig. 1 shows constructional details of PMMC instruments with different constructions of permanent

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