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*This popular dictionary, formerly published as the Penguin Dictionary of Electronics , has been extensively revised and updated, providing clear, concise, and jargon-free A-Z entries on key terms, theories, and practices in the areas of electronics and electrical science. Topics covered include circuits, power, systems, magnetic devices, control theory, communications, signal processing, and telecommunications, together with coverage of applications areas such as image processing, storage, and electronic materials. The dictionary is enhanced by dozens of equations and nearly diagrams.*

- Electrical Engineering Dictionary
- Dictionary of Electrical Engineering
- John Wiley & Sons Books | List of books by author John

*Discover the meaning of some of the most common electrical terms used in our industry. Electromagnetism - The interaction between magnetic fields and electric currents.*

## Electrical Engineering Dictionary

Ammeters are always connected in series with the circuit to be tested. It is obtained by multiplying the current in amperes by the time in hours during which current flows. For example, a battery which provides 5 amperes for 20 hours is said to deliver ampere - hours. One ampere is equal to a current flow of one coulomb per second.

Apparent power is the product of the rms voltage and the rms current. It is made up of conductors which rotate through a magnetic field to provide voltage or force by electromagnetic induction. The pivoted points in generator regulators are also called armatures. Measured in farads as the ratio of the electric charge of the object Q, measured in coulombs to the voltage across the object V, measured in volts.

Commonly used for filtering out voltage spikes. Circuits can be in series, parallel, or in any combination of the two. To restore service, the circuit breaker must be reset closed after correcting the cause of the overload or failure. Circuit breakers are used in conjunction with protective relays to protect circuits from faults. Conductive materials, such as metals, have a relatively low resistance.

Copper and aluminum wire are the most common conductors. Back to Top. Spontaneous corona discharges occur naturally in high-voltage systems unless care is taken to limit the electric field strength. An electric current can be compared to the flow of water in a pipe. Measured in amperes.

See Frequency. Diodes allow current to flow when the anode is positive in relation to the cathode. The sulfuric acid - water solution in a storage battery is an electrolyte.

Measured in volts. It has a negative charge of electricity. It is also used as one theory to explain direction of current flow in a circuit. One farad is equal to one coulomb per volt. It can cause overvoltages and overcurrents in an electrical power system and can pose a risk to transmission and distribution equipment and to operational personnel.

Measured in Hertz. If a current completes one cycle per second, then the frequency is 1 Hz; 60 cycles per second equals 60 Hz. To restore service, the fuse must be replaced using a similar fuse with the same size and rating after correcting the cause of failure.

If the rate of change of current in a circuit is one ampere per second and the resulting electromotive force is one volt, then the inductance of the circuit is one henry. Replacing the earlier term of cycle per second cps. Impedance extends the concept of resistance to AC circuits, and possesses both magnitude and phase, unlike resistance, which has only magnitude. Measured in henry H.

The inductance is directly proportional to the number of turns in the coil. Insulative materials, such as glass, rubber, air, and many plastics have a relatively high resistance. Insulators protect equipment and life from electric shock. Equal to Watt-hours. For example, if a W light bulb is used for 4 hours, 0. Electrical energy is sold in units of kWh. A load rejection test confirms that the system can withstand a sudden loss of load and return to normal operating conditions using its governor.

Load banks are normally used for these tests as part of the commissioning process for electrical power systems. One ohm is equivilant to the resistance in a circuit transmitting a current of one ampere when subjected to a potential difference of one volt. It is analogous to a closed valve in a water system. Each load connected in a separate path receives the full circuit voltage, and the total circuit current is equal to the sum of the individual branch currents.

Measured in Watts. The difference between the two is caused by reactance in the circuit and represents power that does no useful work. Exists in an AC circuit when the current and voltage are not in phase.

Measured in VARS. Electrical resistance can be compared to the friction experienced by water when flowing through a pipe. Measured in ohms. Devices made of semiconductors, notably silicon, are essential components of most electronic circuits.

All of the current in the circuit must flow through all of the loads. The power manifested in tangible form such as electromagnetic radiation, acoustic waves, or mechanical phenomena.

In a direct current DC circuit, or in an alternating current AC circuit whose impedance is a pure resistance, the voltage and current are in phase. Vars may be considered as either the imaginary part of apparent power, or the power flowing into a reactive load, where voltage and current are specified in volts and amperes.

It is the product of the rms voltage and the rms current. One volt is equal to the difference of potential that would drive one ampere of current against one ohm resistance. This is the difference of potential voltage between different points in an electrical circuit. Voltmeters have a high internal resistance are connected across parallel to the points where voltage is to be measured.

One watt is equivalent to one joule per second, corresponding to the power in an electric circuit in which the potential difference is one volt and the current one ampere. If a breaker is timing at 10 cycles slower than nameplate. What equation do I use here? Arc suppression circuits. Power Triangle Calculator. Circuit Breaker Control Schematic Explained. Protective Relay Protection Element Tests.

Circuit Breaker Accessories Explained. Switchboard Ratings. Transformer Insulation Classes. Safety II. Theory III. Testing IV. Basic Electrical Terms and Definitions Understanding electricity requires knowledge of these basic electrical terms. Share this page. Protective Relay Testing and Maintenance Overview. Electrical Drawings and Schematics Overview. Transformer Winding Resistance Testing Explained. Follow TestGuy. Popular topics right now.

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## Dictionary of Electrical Engineering

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Ammeters are always connected in series with the circuit to be tested. It is obtained by multiplying the current in amperes by the time in hours during which current flows. For example, a battery which provides 5 amperes for 20 hours is said to deliver ampere - hours. One ampere is equal to a current flow of one coulomb per second. Apparent power is the product of the rms voltage and the rms current.

tance is measured in terms of capacitance (in resistive A kind of overhead electric power conduc- tor made up of the manufacturer's technical manual of the.

## John Wiley & Sons Books | List of books by author John

Up until now all such dictionaries were containing terms pertaining directly to electrical engineering plus the terminology used in its off-sheets which have evolved into separate disciplines, such as communications, electronics, automation etc. Foremost, however, this Dictionary represents the terminology of electrical engineering, while the branches are represented by their basic terms only. Given the relative small volume about terms , the authors tried to reflect the most important terms in such areas as the cirquit theory,.

Ammeters are always connected in series with the circuit to be tested. It is obtained by multiplying the current in amperes by the time in hours during which current flows. For example, a battery which provides 5 amperes for 20 hours is said to deliver ampere - hours. One ampere is equal to a current flow of one coulomb per second.

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