things we wont let tyre touch when he comes back for pizza
current flow is
the flow of electrons in the circuit
resistance can be calculated by
E divided by I
w divided by E
E squared times w
I divided by E
E divided by I
a three phase load requires a minimum of
a diode is used for?
control the direction of the electron flow
voltage can be calculated by
I divided by R
R divided by I
I x R
w divided by R
I times R
the total resistance of a parllel circuit will be
less than the smallest resistance
what is the term used to describe the output side of a transformer
secondary side
impedance is
opposition to alternating current
an electron has
a negative charge
which of the following is the correct formula for determining wattage in an electrical circuit.
w=E x I
w=E/R
w=I/R
w=E x R
w=E x I
like charges do what
repel each other
which of the following is equal to 100 milliamps?
1.0 amps
10.0 amps
0.10 amps
0.01 amps
0.10 amps
an ohmmeter should never be connected to
a live circuit
what is generally considered to be within the maximum allowable (plus or minus) supply voltage variations
5%
fuses are sized by
volts and amps
the electric meter on a house measures sthe _____ passing through it
wattage
true or false--- a 240 volt 3 wire circuit can be split into two 120 volt circuits
yes true
any material that will readily release electrons is called
a conductor
when testing a capacitor with an analog ohmmeter, the needle on the meter should
deflect towards zero the return to infinite
an electronically commutated motor ( ECM ) is designed to
provide proper air flow under various conditions
on horsepower is equal to _______ watts
746 watts
capacitors are rated in
microfarads and volts
a ______ is commonly used on a single phase fractional horsepower compressor motor to disconnect the start winding after the motor starts
a current relay
which of the following is equal to 2.1 KW
2,100 watts
resistance is
opposition to current flow
when current flows, a ______ is produced around the conductor
magnetic field
which of the following is NOT a factor in determining impedance in an AC circuit
resistance
inductive reactance
capacitive reactance
frequency
frequency
what type of meter uses it own battery
ohmmeter
the safety ground conductor is usually color coded what color?
green
which can be considered and inductive load
electric heat strip
start capacitor
solid state relay
electric motor
electric motor
the symbol for current is
I
in a series circuit, the voltage drop across each resistance (load) will
add up to equal the source voltage
which of the following materials would be best suited for use as a semi conductor?
silicone
which of the following statements about current is true?
current flow is the same as voltage
current flow will increase when voltage increases
current flow will increase when resistance increases
current flow will decrease when voltage increases
current flow will increase when voltage increases
a capacitor analyzer is designed to read
the capacitive resistance of a capacitor
excessive current can be caused by
short circuit
a device with overload protection used to control a motor is a
line starter
contactors are rated according to the maximum amperage through the
contacts
relay are generally used to control inductive loads up to ____ amps
10 amps
in contacts become badly pitted, it is acceptable to
replace the contacts or control