q3 first test
A silicon diodes barrier voltage equals _____ volts
.7
In the second approximation, the external circuit must apply at least ________ v before a silicon diode turns on. Then, no matter how much current there is, the diode drop is ______v.
.7
The forward-bias voltage across a silicon diode must be equal to or greater than _____ Volts before the diode will conduct appreciably.
.7
How many junctions are in a diode?
1
Materials that are conductors will have between ______ and _____ valence electrons.
1, 3
Positive lead of a diode is called?
ANODE
Identify the leads of this diode: ( ) ---->I----- ( )
Anode (P), Cathode (N)
True or False: A junction diode may be compared with a resistor because it permits current to flow through it in either direction
FALSE
To make a diode conduct useful circuit current it must be _______ biased to the _________ voltage
Forward, barrier
An oscilloscope uses the ______ to measure time and the _______ axis to measure voltage.
Horizontal, vertical
The first approximation of a diode is also known as the _____ diode.
Ideal
Germanium and silicon in their pure form are?
Insulators
The forward resistance of a silicon diode is ____ than the reverse resistance
Less
In silicon which has been doped with impurities such as arsenic, there is an increased number of (negative, positive) charge carriers and the material is (N,P) type.
Negative, N type
3 advantages of semiconductors vs vacuum tubes
No warm up time use little power and heat smaller, lighter and faster
When troubleshooting, what instrument should be used to perform a continuity check?
Ohmmeter
When measuring voltage, meter is placed in ???
Paralell
To forward bias a junction diode, connect the ______ lead of the battery to the P-type terminal of the diode and the ______ lead to the N-type terminal
Positive, Negative
An ideal diode acts like a _____ switch when forward biased and an _____ switch when reversed
closed, open
When no bias is applied the holes and electrons near the junction pair up (recombine) by attraction and form a ______ region.
depletion
Identify the uses for diodes in DC circuits
prevents reverse current
Identify the uses for diodes in AC circuits
rectification
When used as a voltage regulator, a zener diode must be in _______ biased.
reverse
In the third approximation of a silicon diode, we visualize a _________ in series with a -.7v battery and a _________ resistance
switch, bulk
How many leads does a diode have?
2
Silicon and Germanium are semiconductors and have just _____ valence electrons.
4
Insulators will have between _____ and _____ valence electrons.
5, 8
The _________ resistance is the resistance of the P and N regions.
Bulk
Negative lead of a diode is called?
Cathode
Meters are designed to indicate ______ ac voltage and ________ dc voltage
Rms, adverage
When measuring current, meter is placed in ????
Series
The most common semiconductor material is???
Silicon
True or false: oscilloscopes can measure both ac and dc voltages.
True
When using an ohmmeter, what precaution should be used?
Turning circuit off
After a diode is "turned on" an increase in forward voltage across the diode results in ________ current through the diode.
increase
The volt-ampere characteristic of a junction diode is a graph of ______ versus _______.
voltage, current
