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Electronics: Zener Diode Symbol and Operation

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Electronics: Zener Diode Symbol and Operation

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Questions and Answers

What happens to the reverse current as the reverse voltage is increased in a zener diode?

It becomes constant

It fluctuates

It remains extremely small (correct)

It increases rapidly

What is the main purpose of a zener diode?

To operate as an amplifier

To operate as a switch

To operate in the forward-bias region

To operate in the breakdown region (correct)

What effect does the increase in reverse current have on the zener impedance (ZZ) in a zener diode?

It increases rapidly

It remains constant

It fluctuates

It decreases rapidly (correct)

Which part of a zener diode's characteristic curve marks the beginning of the breakdown effect?

'Knee' of the curve Signup and view all the answers

What happens to the zener breakdown voltage (VZ) as the zener current (IZ) increases?

It remains essentially constant Signup and view all the answers

What does an actual voltage curve in a zener diode indicate when a change in zener current occurs?

A small change in zener voltage Signup and view all the answers

What is the ratio of voltage to current in an LED?

It varies depending on the LED material Signup and view all the answers

How is the light output of an LED affected by temperature?

Light intensity decreases with higher temperature Signup and view all the answers

What type of material was used in early LEDs that emitted invisible IR radiation?

Gallium Arsenide (GaAs) Signup and view all the answers

What is the zener impedance?

The change in voltage for a certain change in current on a zener diode Signup and view all the answers

What happens when an LED is forward-biased?

Electrons move from p-type material to n-type material Signup and view all the answers

What was used to produce the first visible red LEDs?

Gallium Arsenide Phosphide (GaAsP) on a GaAs substrate Signup and view all the answers

What does Ohm’s law indicate about impedance?

Impedance is inversely proportional to current Signup and view all the answers

What characteristic curve does a zener diode exhibit a certain change in VZ for a certain change in IZ?

(Linear) characteristic curve Signup and view all the answers

What was the semiconductor material used in early LEDs that emitted IR radiation?

(GaAs) Gallium Arsenide Signup and view all the answers

According to Ohm's law, what does I/Z represent for LEDs?

It represents the current-voltage ratio. Signup and view all the answers

What is the effect of temperature on the light intensity of an LED?

Light intensity decreases with higher temperature. Signup and view all the answers