Deck 5: Light Emitting Diodes Leds and Photodiodes

Question 1

The output voltage of a photodiodes is approximately ____ volts.

A) .35
B) .40
C) .45
D) .50

Answer 1

C

Question 2

____ can be used to determine what size resistor should be connected in the circuit.

A) Ohm's Law
B) Newton's Law
C) Coulomb's Law
D) Einstein's Law

Answer 2

A

Question 3

Junction diodes have a forward voltage drop of about ____ volts for silicon.

A) .4
B) .7
C) 1.4
D) 1.7

Answer 3

B

Question 4

A seven segment display uses seven LEDs.

Question 5

Junction diodes typically have a PIV rating of ____ volts or greater.

A) 5
B) 45
C) 75
D) 100

Question 6

LEDs have a forward voltage drop of about ____ volts or greater depending on the material the diode  is made of.

A) .4
B) .7
C) 1.4
D) 1.7

Question 7

Dark current is generally in the range of a few nanoamperes.

Question 8

Most LEDs operate at about 100 ma or less current.

Question 9

The electrical characteristics of LEDs vary considerably from those of the common junction or  rectifier diode.

Question 10

Junction diodes typically have a PIV rating of 100 volts or greater, but LEDs have a typical PIV rating  of about 5 volts.