Capítulo 32
Circuitos de Corrente Alternada
Fontes CA
Direct current is a flow of electric charge in only one direction and has a steady state of constant voltage in the circuit. Rectifiers, batteries, ...
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Valor Eficaz em um Circuito de Corrente Alternada
The root mean square (RMS) value is a measure of the effective or average value of an alternating current (AC) waveform. In AC circuits, the voltage or ...
Resistor em um Circuito CA
An alternating emf or voltage source is needed to supply an alternating current (AC) to a circuit. A coil of wire rotating in a magnetic field at a ...
Capacitor em um Circuito CA
A capacitor is charged by passing an electric current through it, which causes the plates to start accumulating an electrostatic charge. Since the ...
Indutor em um Circuito CA
The basic components of an inductor are coils or loops of wire that are either wound around a hollow tube former or a ferromagnetic material (iron-cored) ...
Circuitos RLC em Série: Introdução
Consider an RLC series circuit consisting of a resistor, an inductor, and a capacitor connected to an AC voltage source. A current, which varies ...
Circuitos RLC em Série: Impedância
When current flow is opposed in a DC or AC circuit, it is referred to as resistance or impedance, respectively. Impedance plays a key role in determining ...
Circuito RLC em Série: Resolução de Problemas
Consider an AC generator with a frequency of 50 hertz and a voltage of 120 volts. The AC generator is connected to an RLC series circuit with a 20-ohms ...
Potência em um Circuito CA
In a DC circuit, the power consumed is simply the product of the DC voltage times the DC current, given in watts. However, the power consumed for AC ...
Ressonância em um Circuito CA
The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge ...
Transformadores
A device that transforms voltages from one value to another using induction is called a transformer. A transformer consists of two separate coils, or ...
Tipos de Transformadores
Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in ...
Perdas de Energia em Transformadores
In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary ...
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