AC systems Test
how much horse power is required by a 1/4-hp motor?
186.5 w
the effective voltage is 480v... what is the peak voltage?
480 X 1.414 =679v /120 x 1.414= 170v
reducing resistance of wire by one half will reduce power loss by__________ but reducing the current by one half will reduce the power loss by?
50%/75%
Determine cosine of angle theta
Adj over hypo
_________ is the induction of voltage or CEMF that opposes the current flow in a coil
Inductive reactance
In an AC circuit, when both the current and voltage of the circuit have a negative value, the power of this circuit is ?
Positive
In an AC circuit, when both the current and voltage of the circuit have a positive value, the power of this circuit is ? .
Positive
In an AC circuit, when current of the circuit is ? and the voltage of the circuit is negative, the power of this circuit has a negative value.
Positive
Formula for determining total resistance in series circuit
Rt= R1+R2+R3....Rn
reduce a vector to its horizontal component... X
X= Cos..(angle) x 100
reduce a vector to its vertical component.... Y
Y= Sin (angle) x 100
In an AC circuit, when the current of the circuit is negative and the voltage of the circuit is zero, the power of this circuit has a ? value.
Zero
to determine a vectors X and Y componets when the magnitude and angle are known one typically uses the function__________ to find x and _________ to find Y?
cosine/sine
Adjacent=
horizontal
a value of ac voltage that is measured from maximum value in the positive direction to the maximum value in a negative direction is called the?
peak to peak value
hypotenuse=
resultant
determine angle of theta
tan= opp over adj. take that number in calculator with Tan-1
a measurement taken from zero to the highest value obtained in either the positive or negative half of a sine wave would determine?
the peak value
the total current limiting effect of the inductor is a combination of the inductive reactance and resistance of the inductor
true
opposite=
vertical
