Chapter 3 - LEDs Quiz

What does LED stand for in electronics?

• Light Emitting Diode

• Liquid Emission Device

• Low Energy Display

• Linear Electric Device

Which of the following is a correct symbol for an LED?

• A diode symbol with two arrows pointing away

• A resistor symbol

• A diode symbol with two arrows pointing inwards to the diode

• A capacitor symbol

At what current do LEDs typically begin to emit light?

• 0.5mA to 1.5mA

• 10mA to 20mA

• 30mA to 50mA

• 100mA to 200mA

What is the relationship between forward current and light output in an LED?

• Light output increases with forward current

• Light output decreases with forward current

• Light output is independent of current

• Light output is maximum at zero current

Which of the following statements is true about low-current LEDs?

• They glow brightly with less current

• They require more current to glow

• They do not emit light

• They are larger in size

What is the effect of applying a voltage much above the typical level to an LED?

• Too much current will flow and the LED will burn out

• The LED will emit less light

• The LED will become a resistor

• The LED will start blinking

What is the function of the arrows in the symbol of an LED?

• They indicate light emission

• They indicate current direction only

• They indicate resistance

• They indicate voltage drop

Which of the following is a correct statement about the direction of current flow in an LED?

• Current flows from anode to cathode

• Current flows from cathode to anode

• Current flows in both directions

• Current does not flow at all

What are the two main types of LED 7-segment displays?

• Common anode and common cathode

• Series and parallel

• Digital and analog

• Active and passive

In a common anode 7-segment display, what is connected together?

• All anodes

• All cathodes

• All resistors

• All transistors