955 test questions with passed
solutions!!
State Ohm's law CORRECT ANSWERS V=IXR
R=V/I
I=V/R
If current goes down, what does resistance do? CORRECT ANSWERS Reistance goes
up
If Voltage is CONSTANT and Resistance goes DOWN, what must Current do?
CORRECT ANSWERS Current HAS to go UP!
What is the definition of a short circuit? CORRECT ANSWERS Zero resistance. Circuit
has high current, and zero resistance.
What would cause Current to DECREASE in a circuit, IF Voltage remained
CONSTANT? CORRECT ANSWERS INCREASSE in Resistance
What is a Transformer? CORRECT ANSWERS 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? CORRECT ANSWERS Used to convert between high
and low voltages and for impedance transformation.
State the Power formula. CORRECT ANSWERS P = V X I
power equals voltage times current
What are air core transformers main use? CORRECT ANSWERS Radio frequency
circuits ABOVE 20kHz
What are iron core transformers main use? CORRECT ANSWERS Lower frequency:
below 20kHz
To transmit electrical power what must a transformer have? CORRECT ANSWERS 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.
*How does a Power Station function? CORRECT ANSWERS Uses high voltage to
reduce the amount and weight and therefore
What is the symbol for a transformer? CORRECT ANSWERS XX
solutions!!
State Ohm's law CORRECT ANSWERS V=IXR
R=V/I
I=V/R
If current goes down, what does resistance do? CORRECT ANSWERS Reistance goes
up
If Voltage is CONSTANT and Resistance goes DOWN, what must Current do?
CORRECT ANSWERS Current HAS to go UP!
What is the definition of a short circuit? CORRECT ANSWERS Zero resistance. Circuit
has high current, and zero resistance.
What would cause Current to DECREASE in a circuit, IF Voltage remained
CONSTANT? CORRECT ANSWERS INCREASSE in Resistance
What is a Transformer? CORRECT ANSWERS 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? CORRECT ANSWERS Used to convert between high
and low voltages and for impedance transformation.
State the Power formula. CORRECT ANSWERS P = V X I
power equals voltage times current
What are air core transformers main use? CORRECT ANSWERS Radio frequency
circuits ABOVE 20kHz
What are iron core transformers main use? CORRECT ANSWERS Lower frequency:
below 20kHz
To transmit electrical power what must a transformer have? CORRECT ANSWERS 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.
*How does a Power Station function? CORRECT ANSWERS Uses high voltage to
reduce the amount and weight and therefore
What is the symbol for a transformer? CORRECT ANSWERS XX
