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Apparent Power

Apparent Power and Power Factor: Apparent Power - The power factor is useful in determining useful power (true power) transferred to a load. The highest power factor is 1, which…

Directional Overcurrent Relays in Power Systems

Directional Overcurrent Relays in Power Systems: Directional Overcurrent Relays in Power Systems - Relay connections must be made so that the currents and voltages applied to the relay during the…

Important Questions of Variable Load on Power Stations

Important Questions of Variable Load on Power Stations: 1. Why is the load on a power station variable ? What are the effects of variable load on the operation of…

Important Questions of Economics of Power Generation

Important Questions of Economics of Power Generation: 1. Explain the terms interest and depreciation as applied to economics of power generation. 2. Discuss the different classifications of costs of electrical…

BJT Power Amplifier with Op Amp Driver

BJT Power Amplifier with Op Amp Driver: BJT Power Amplifier with Op Amp Driver Circuit Operation - The Class-AB power shown in Fig. 18-39 uses an operational amplifier (A1) for…

Power Supply Decoupling

Power Supply Decoupling: Power Supply Decoupling - High-power amplifiers require high supply current levels, so unregulated power supplies are often employed to avoid the power wasted in a series regulator.…

Power Dissipation Rating in Transistor

Power Dissipation Rating in Transistor: Maximum Power Dissipation - Consider the portion of the data sheet for the 2N3903 and 2N3904 transistor reproduced in Fig. 8-24. The total device dissipation (PD)…

Slip Power Recovery Scheme used in Induction Motor

Slip Power Recovery Scheme used in Induction Motor: Slip Power Recovery Scheme used in Induction Motor - Figure 6.53 shows an equivalent circuit of a wound-rotor induction motor with voltage…