Question
Why do we need filters in a power supply?
✓
Answer
A rectifier-half-wave or full-wave – outputs a pul-sating dc which is not directly usable in most electronic circuits. These circuits require something closer to pure dc as produced by batteries. Unlike pure dc waveform of a battery, a rectifier output has an ac ripple riding on a dc waveform.
The circuit used in a dc power supply to remove the ripple is called a filter. A filter circuit can produce a very smooth waveform that approximates the waveform produced by a battery. The most common technique used for filtering is a capacitor connected across the output of a rectifier.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In Young's experiment, the ratio of intensity at the maxima and minima in an interference pattern is \(36: 9\). What will be the ratio of intensities of two interfering waves?
Explain back emf in a motor.
How is potential gradient measured? Explain.
In a single slit diffraction pattern, the distance between first minima on the right and first minima on the left of central maximum is \(4 mm\). The screen on which the pattern is displaced, is \(2 m\) from the slit and wavelength of light used is 6000Å. Calculate width of the slit and width of the central maximum.
Derive Laplace's law for spherical membrane of bubble due to surface tension.
A rectangular loop of wire hanging vertically with one end in a uniform magnetic field $\vec{B}$, supports a small block of mass $m . \vec{B}$ points into the page in the shaded region of below figure. For what current I in the loop would the magnetic force exactly balance the downward gravitational force?
→Calculate the radius of second Bohr orbit in hydrogen atom from the given data. Mass of electron \(=9.1 \times 10^{-31} kg\); Charge on the electron \(=1.6 \times 10^{-19} C\); Planck's constant \(=6.63 \times 10^{-34} J - s\).; Permittivity of free space \(=8.85 \times 10^{-12} C ^2 / Nm ^2\).
With four capacitors of the same capacity, when three of them are connected in parallel and the remaining one in connected in series with this combination, the resultant capacity is 3.75 $\mu F$. Find the capacity of each capacitor.
→A coin is placed on a stationary disc at a distance of $1 \mathrm{~m}$ from the disc's centre. At time $t=0$ $\mathrm{s}$, the disc begins to rotate with a constant angular acceleration of $2 \mathrm{rad} / \mathrm{s}^2$ around a fixed vertical axis through its centre and perpendicular to its plane.
Find the magnitude of the linear acceleration of the coin at $t=1.5 \mathrm{~s}$. Assume the coin does not slip.
→Find the magnitude of the linear acceleration of the coin at $t=1.5 \mathrm{~s}$. Assume the coin does not slip.
Distinguish between a step-up and a step-down transformers. (Any two points)