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955 test Questions and Answers with 100% Complete Solutions
UPDATED!!!
State Ohm's law - ANSWER V=IXR
R=V/I
I=V/R
If current goes down, what does resistance do? - ANSWER
Reistance goes up
If Voltage is CONSTANT and Resistance goes DOWN, what must
Current do? - ANSWER Current HAS to go UP!
What is the definition of a short circuit? - ANSWER Zero
resistance. Circuit has high current, and zero resistance.
What would cause Current to DECREASE in a circuit, IF Voltage
remained CONSTANT? - ANSWER INCREASSE in Resistance
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What is a Transformer? - ANSWER An electrical device that
transfers energy from one electrical circuit to another by
magnetic coupling, aka: Mutal Induction. One set of windings
induce a voltage in the other set of windings.
What are Transformers used for? - ANSWER Used to convert
between high and low voltages and for impedance
transformation.
State the Power formula. - ANSWER P = V X I
power equals voltage times current
What are air core transformers main use? - ANSWER Radio
frequency circuits ABOVE 20kHz
What are iron core transformers main use? - ANSWER Lower
frequency: below 20kHz
To transmit electrical power what must a transformer have? -
ANSWER Has a very high current OR very high voltage. High
current means a high flow rate of electrons. This requires a
VERY large COPPER or ALUMINUM cable.
955 test Questions and Answers with 100% Complete Solutions
UPDATED!!!
State Ohm's law - ANSWER V=IXR
R=V/I
I=V/R
If current goes down, what does resistance do? - ANSWER
Reistance goes up
If Voltage is CONSTANT and Resistance goes DOWN, what must
Current do? - ANSWER Current HAS to go UP!
What is the definition of a short circuit? - ANSWER Zero
resistance. Circuit has high current, and zero resistance.
What would cause Current to DECREASE in a circuit, IF Voltage
remained CONSTANT? - ANSWER INCREASSE in Resistance
, 2|Page
What is a Transformer? - ANSWER An electrical device that
transfers energy from one electrical circuit to another by
magnetic coupling, aka: Mutal Induction. One set of windings
induce a voltage in the other set of windings.
What are Transformers used for? - ANSWER Used to convert
between high and low voltages and for impedance
transformation.
State the Power formula. - ANSWER P = V X I
power equals voltage times current
What are air core transformers main use? - ANSWER Radio
frequency circuits ABOVE 20kHz
What are iron core transformers main use? - ANSWER Lower
frequency: below 20kHz
To transmit electrical power what must a transformer have? -
ANSWER Has a very high current OR very high voltage. High
current means a high flow rate of electrons. This requires a
VERY large COPPER or ALUMINUM cable.
