In a transformer, the primary winding (inductor) and the secondary winding (also an inductor) are typically connected in parallel with each other rather than in series. This configuration allows for efficient energy transfer between the windings. When an alternating current (AC) flows through the primary winding, it generates a magnetic field that induces a voltage in the secondary winding due to electromagnetic induction. Connecting the windings in parallel ensures that both windings receive the same voltage waveform and allows for effective transfer of power from the primary to the secondary winding, facilitating voltage transformation and electrical isolation between circuits.
Resistors and inductors are connected in parallel in certain circuits to achieve specific electrical characteristics or impedance matching. For example, in filter circuits or impedance matching networks, a resistor and an inductor may be connected in parallel to form a series resonance circuit. This configuration can create a narrowband frequency response or provide impedance matching between stages of a circuit. Parallel connection allows each component to contribute to the overall circuit behavior independently while sharing the same voltage across their terminals.
In some circuits, a resistor is connected in series with an inductor to limit the current flowing through the inductor and control its rate of change. This combination can be found in transient suppression circuits or in applications where damping of oscillations or controlling the rise time of current in the inductor is necessary. The resistor helps to stabilize the circuit and prevent excessive current flow that could potentially damage the inductor or other components.
In an inductor filter, inductors are typically connected in series with the load or the circuit being filtered. This arrangement allows the inductors to provide impedance to specific frequencies of electrical signals, effectively filtering out unwanted frequencies or noise from the circuit. By connecting inductors in series, their cumulative impedance affects the passage of frequencies through the circuit, thereby shaping the frequency response and improving signal quality.
Inductors are connected in parallel in circuits where multiple inductance values are needed or where additional inductance is required to achieve a specific impedance or resonant frequency. Parallel connection of inductors can increase the total inductance in a circuit, provide redundancy, or offer alternative paths for current flow depending on circuit design requirements. This configuration allows for flexibility in designing circuits with desired electrical characteristics such as impedance matching, filtering, or energy storage capabilities.