Define rectification .

The process of converting alternating current and voltage into direct current and voltage.

How many diodes are used in half-wave rectification, and when does the diode conduct?

One diode is used; it conducts only during the positive cycles of the input alternating voltage.

What is the main advantage of full-wave rectification compared to half-wave rectification?

More power is available, since power is supplied on every half-cycle rather than only during the positive half-cycles.

In half-wave rectification, the diode only conducts during the .......... cycles of the input alternating voltage.

In half-wave rectification, the diode only conducts during the positive cycles of the input alternating voltage.

True or False? In full-wave rectification, the current in the load resistor reverses direction on alternate half-cycles.

False. The current in the load resistor flows in the same direction during both the positive and negative cycles of the input voltage.

Describe the shape of the output voltage-time graph for half-wave rectification.

A sine curve on the positive cycles, with a flat line at V out = 0 during the negative cycles.

The reduction in the variation of the output voltage or current.

Where is a smoothing capacitor connected relative to the load resistor?

In parallel with the load resistor.

The amount of smoothing is controlled by the .......... of the capacitor and the resistance of the load resistor.

The amount of smoothing is controlled by the capacitance of the capacitor and the resistance of the load resistor.

True or False? Using a smoothing capacitor with a smaller capacitance increases the amount of smoothing.

False. A larger capacitance (or larger load resistance) increases the amount of smoothing, since it slows the rate of discharge and reduces the ripple.

How does a smoothing capacitor's charging and discharging produce a smoothed output?

It charges from the input voltage and maintains the voltage at a high level, then discharges gradually as the rectified voltage drops, before charging again as the voltage rises.

A LevelPhysicsCambridge (CIE)Flashcards21. Alternating CurrentsRectification & Smoothing

Rectification & Smoothing (Cambridge (CIE) A Level Physics): Flashcards

Exam code: 9702

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Define rectification.

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Cards in this collection (13)

Define rectification.
The process of converting alternating current and voltage into direct current and voltage.
How many diodes are used in half-wave rectification, and when does the diode conduct?
One diode is used; it conducts only during the positive cycles of the input alternating voltage.
How many diodes are used in a full-wave bridge rectifier circuit?
Four diodes.
What is the main advantage of full-wave rectification compared to half-wave rectification?
More power is available, since power is supplied on every half-cycle rather than only during the positive half-cycles.
In half-wave rectification, the diode only conducts during the .......... cycles of the input alternating voltage.
In half-wave rectification, the diode only conducts during the positive cycles of the input alternating voltage.
True or False?
In full-wave rectification, the current in the load resistor reverses direction on alternate half-cycles.
False.
The current in the load resistor flows in the same direction during both the positive and negative cycles of the input voltage.
Describe the shape of the output voltage-time graph for half-wave rectification.
A sine curve on the positive cycles, with a flat line at V_out = 0 during the negative cycles.
Define smoothing.
The reduction in the variation of the output voltage or current.
Where is a smoothing capacitor connected relative to the load resistor?
In parallel with the load resistor.
What condition must the time constant of a smoothing capacitor satisfy for effective smoothing?
The time constant $τ = R C$ must be greater than the time interval between adjacent peaks of the output signal.
The amount of smoothing is controlled by the .......... of the capacitor and the resistance of the load resistor.
The amount of smoothing is controlled by the capacitance of the capacitor and the resistance of the load resistor.
True or False?
Using a smoothing capacitor with a smaller capacitance increases the amount of smoothing.
False.
A larger capacitance (or larger load resistance) increases the amount of smoothing, since it slows the rate of discharge and reduces the ripple.
How does a smoothing capacitor's charging and discharging produce a smoothed output?
It charges from the input voltage and maintains the voltage at a high level, then discharges gradually as the rectified voltage drops, before charging again as the voltage rises.

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