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#rectifier

9 public questions tagged with this topic.

Rectifiers, Filters and Applications

In a rectifier with a capacitor filter, the capacitor discharges through:

**Rectifier applications** diode must have reverse breakdown voltage higher than peak inverse voltage, centre-tap transformer provides two opposite phase voltages for full-wave, capacitor discharges through load R_L when diode off, drift current in junction is minority carrier motion due to field, diffusion due to gradient, diode conducts when forward biased anode positive. The capacitor charges to the peak voltage and discharges through the load resistor ( R_L ) during the non-conducting half-cycle, smoothing the output voltage. Substituting values gives Load resistor, which matches expected

Ref: NCERT > Physics Book > Electronic Devices > Rectifiers, Filters and Applications

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Rectifiers, Filters and Applications

In a half-wave rectifier, the output frequency is:

**Rectifier applications** diode must have reverse breakdown voltage higher than peak inverse voltage, centre-tap transformer provides two opposite phase voltages for full-wave, capacitor discharges through load R_L when diode off, drift current in junction is minority carrier motion due to field, diffusion due to gradient, diode conducts when forward biased anode positive. A half-wave rectifier conducts only during the positive half-cycle of the AC input, so the output frequency remains the same as the input frequency (e.g., 50 Hz input gives 50 Hz output). Substituting values gives Equal to

Ref: NCERT > Physics Book > Electronic Devices > Rectifiers, Filters and Applications

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Rectifiers, Filters and Applications

In a full-wave rectifier, the voltage across each diode is:

**Rectifier applications** diode must have reverse breakdown voltage higher than peak inverse voltage, centre-tap transformer provides two opposite phase voltages for full-wave, capacitor discharges through load R_L when diode off, drift current in junction is minority carrier motion due to field, diffusion due to gradient, diode conducts when forward biased anode positive. In a centre-tap full-wave rectifier, each diode rectifies half the total secondary voltage, as the centre tap splits the AC input into two equal halves. Substituting values gives Half the secondary voltage, which matches ex

Ref: NCERT > Physics Book > Electronic Devices > Rectifiers, Filters and Applications

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p-n Junction, Depletion Region and Diode Characteristics

In a rectifier circuit, the diode conducts when it is:

**Diode characteristics** forward bias reduces barrier, width of depletion region decreases, resistance low ~10-100 Ω, current primarily due to majority diffusion, exponential I = I_s(e^{eV/kT}-1), reverse bias widens depletion region, resistance high ~MΩ, dominant current drift due to minority carriers, reverse saturation current small μA-nA, typically 10⁻⁶ A, increases sharply at breakdown Zener/avalanche. A diode conducts in forward bias (p-side positive, n-side negative), allowing current to flow through the load, which is the basis of rectification in both half-wave and full-wave circuits

Ref: NCERT > Physics Book > Electronic Devices > p-n Junction, Depletion Region and Diode Characteristics

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Rectifiers, Filters and Applications

The ripple in a rectifier output is reduced by using:

**Capacitor filter** purpose to reduce ripple, capacitor charges to peak during diode conduction and discharges through load during non-conduction, time constant τ = R C, larger RC less ripple, ripple reduced by using capacitor or LC filter, output of half-wave without filter is pulsating half sinusoids, full-wave without filter is two half sinusoids per cycle. A capacitor filter smooths the pulsating DC output by charging during peaks and discharging during troughs, reducing AC ripples to provide a steadier DC voltage. Substituting values gives Capacitor, which matches expected behaviour for

Ref: NCERT > Physics Book > Electronic Devices > Rectifiers, Filters and Applications

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p-n Junction, Depletion Region and Diode Characteristics

The primary function of a p-n junction diode is to:

**Diode characteristics** forward bias reduces barrier, width of depletion region decreases, resistance low ~10-100 Ω, current primarily due to majority diffusion, exponential I = I_s(e^{eV/kT}-1), reverse bias widens depletion region, resistance high ~MΩ, dominant current drift due to minority carriers, reverse saturation current small μA-nA, typically 10⁻⁶ A, increases sharply at breakdown Zener/avalanche. A p-n junction diode allows current in forward bias (low resistance) and blocks it in reverse bias (high resistance), making it ideal for rectification of AC to DC. Substituting values giv

Ref: NCERT > Physics Book > Electronic Devices > p-n Junction, Depletion Region and Diode Characteristics

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Rectifiers, Filters and Applications

The time constant of a capacitor filter in a rectifier depends on:

**Rectifier** converts AC to DC using diode unilateral conduction, half-wave conducts only during positive half-cycle when forward biased, output pulsating DC with frequency equal to input 50 Hz, full-wave with centre-tap uses two diodes conducting alternate half-cycles, output frequency 100 Hz for 50 Hz input, 120 Hz for 60 Hz input, output voltage closer to peak with capacitor filter. The time constant ( tau = R_L C ) in a capacitor filter determines the discharge rate, depending inversely on the product of capacitance ( C ) and load resistance ( R_L ). Substituting values gives Capacitance

Ref: NCERT > Physics Book > Electronic Devices > Rectifiers, Filters and Applications

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