Definition of AC BridgeAn AC bridge is a specialized electrical instrument used for the precise measurement of unknown electrical parameters such as resistance, inductance, and capacitance. Renowned for its convenience and accuracy, the AC bridge plays a crucial role in various electrical engineering applications.Construction and Working PrincipleThe construction of an AC bridge is relatively straightforward. It comprises four arms, an AC supply source, and a balance detector. The four arms of t

Campbell Bridge: Definition and FunctionDefinitionThe Campbell bridge is a specialized electrical bridge designed to measure unknown mutual inductance. Mutual inductance refers to the physical phenomenon where a change in the current flowing through one coil induces an electromotive force (emf) and, consequently, a current in a neighboring coil. This bridge is not only useful for determining mutual inductance values but can also be employed to measure frequency. It does so by adjusting the mutua

DefinitionA potentiometer that measures the phase and magnitude of an unknown electromotive force (emf) by comparing it with a known emf is called an AC potentiometer. The working principle of an AC potentiometer is the same as that of a DC potentiometer, that is, the unknown voltage is determined by comparing it with a known voltage. When the two are equal, the galvanometer indicates the null point, and thus the value of the unknown emf is obtained.The operation of an AC potentiometer is more c

DefinitionA hot - wire instrument is defined as a type of measuring device that utilizes the heating effect of an electric current to determine the magnitude of that current. Its operation is based on the principle that when an electric current passes through a wire, the heat generated causes the wire to expand, increasing its length. This versatile instrument is capable of measuring both alternating current (AC) and direct current (DC), making it a valuable tool in various electrical applicatio

DefinitionA thermocouple instrument is defined as a measuring device that utilizes a thermocouple to determine temperature, current, and voltage. This versatile instrument is capable of making measurements in both alternating current (AC) and direct current (DC) circuits, making it a valuable tool across a wide range of applications.Thermocouple BasicsA thermocouple is an electrical device consisting of two wires made from different metals. Its functionality is based on a fundamental principle:

What is Capacitive Voltage Transformer?Definition: A capacitive voltage transformer (CVT), also known as a capacitive potential transformer, steps down high - voltage input signals to provide low - voltage signals that can be easily measured by measuring instruments.The capacitive potential divider, inductive element, and auxiliary transformer are the three main components of a capacitive potential transformer.Why is a Capacitive Voltage Transformer (CVT) Needed?When measuring high voltages abov

Dual Trace OscilloscopeDefinition: In a dual - trace oscilloscope, a single electron beam generates two traces, which are deflected by two independent sources. To produce these two separate traces, two main methods are employed: the alternate mode and the chopped mode. These are also referred to as the two operating modes of the switch.A question then arises: why is such an oscilloscope necessary?When analyzing or studying multiple electronic circuits, comparing their voltages is crucial. One op

What is Electronic Voltmeter?DefinitionAn electronic voltmeter is a voltmeter that utilizes an amplifier to enhance its sensitivity. It is capable of measuring the voltages of both AC and DC devices. Thanks to its high input resistance, the electronic voltmeter provides accurate readings.A moving - coil voltmeter struggles to detect low voltages, but the electronic voltmeter overcomes this limitation. The electronic voltmeter has high input impedance, enabling it to detect signals of extremely w

What is Differential Voltmeter ？Definition: A voltmeter that measures the difference between a known voltage source and an unknown voltage source is called a differential voltmeter. It operates based on the principle of comparing the reference voltage source with the unknown voltage source.The differential voltmeter offers very high accuracy. Its operating principle is similar to that of a potentiometer, and thus it is also known as a potentiometer voltmeter.Construction of Differential Voltmete

The No - Load Test serves as an indirect approach for ascertaining the efficiency of three - phase induction motors. It also enables the determination of the circuit parameters of their equivalent circuits. Similarly, the open - circuit test is carried out on transformers. In fact, the no - load test on an induction motor is conceptually equivalent to the open - circuit test on a transformer.During this test, the motor is decoupled from its load. Then, the rated voltage at the rated frequency is