Motor Starter Control Circuit Diagram

Figure 2 Three Phase induction motor

The electrical industry has established a universal set of symbols and rules on how line diagrams (circuits) are laid out. By applying these standards, an electrician establishes a working practice with a language in common with all electricians. One Load per Line No more than one load should be placed …

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Oscilloscope Working Principle | Oscilloscope Parts and Function

oscilloscope

Oscilloscopes come in a variety of brands and complexities. Two general categories of oscilloscopes include those used for general-purpose bench work applications, and the more complex (and expensive) laboratory-quality oscilloscopes, Figure 1a and b. A portable scope is shown in Figure 1c. Figure 1: (a) General-purpose oscilloscope; (b) lab-quality oscilloscope; …

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Power Transformer Characteristics

Power transformers

Power transformers, Figure 1, typically have the following features: They are heavy (because of their iron core) and can be very large, like the transformers on telephone poles. However, power transformers in electronic devices are much smaller and vary considerably in size. They have a laminated iron core to reduce …

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Types of Electric Motors and their Applications

three phase motor

Although there are many different types and sizes of motors, most electric motors used in commercial and industrial applications can be classified as single-phase (1 φ) or three-phase (3 φ). Single-phase motors are commonly used in some commercial applications such as garage door openers, sump pumps, automatic doors, and ceiling …

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Basic Electrical Questions and Answers

These questions are primarily related to Capacitance, Electric Current, Resistors in Series and Parallel. These topics are covered in detail here: Capacitance Electric Current Series and Parallel Circuit   Determine the voltage when 500 J of energy is used to move 10 C of charge.           …

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Energy Resources Questions Answers

These questions are related to Type of Fuels, Solar Energy, Wind Energy, and Nuclear Energy that are covered in detail here: How Does Nuclear Energy Work All about Solar Energy | Solar Energy Environmental Impact Global Wind Patterns | Environmental Impact of Wind Energy Types of Fossil Fuels What are …

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Electrical Protective Devices

Fuses and circuit breakers are placed in the current path of an electric circuit. They are used to create an open (break in the circuit) when the current exceeds a specified number of amperes due to a malfunction or other abnormal condition. The basic difference between a fuse and circuit …

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Digital Multimeter Working Principle

Typical DMM with probes

To test and troubleshoot circuits, it is necessary to understand how to use basic electronic measuring instruments. The digital multimeter (DMM) is the most widely used electronic measuring instrument. Also, the clamp-type ammeter is useful for measuring current, especially in power applications. An older analog meter called the volt-ohm-milliammeter (VOM) …

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Capacitors, Inductors, and Transformers

A resistor presents a fixed value of resistance (opposition to current) that is independent of the type of voltage (dc or ac) applied to it. Capacitors and inductors are two types of electrical components classified as reactive, which means that their opposition to current depends on the type of voltage …

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