chapter 3 exam
the product over sum method is used to calcuate the reisstance of _____ at a time
2
a balanced multiwire branch will have current flow only on the ungrounded condcutors
tru
a balanced 3wire system single phase circuit is connected so tht the ungrounded conductors are from different transformers phases 1 and 2. the current on the neutral conductor wil be _____ percent of the ungrounded conductor
0
what is the voltage drop of two 12 awg conductors, each 100ft in length, supplying a 4wire 16A load? the resistance is 2ohms per 1k feet.
3.2V
what is the voltage drop of two 12 awg conductors, each 100ft in length, supplying a 2wire 16A load? the resistance is 2ohms per 1k feet.
6.4V
When power supplies are connected in series, the circuit voltage remains the same as when only one power supply is connected to it, provided polarities are connected right
False
A series circuit is a circuit in which a specific amount of current leaves the voltage source and flows through every electrical device in a single path before it returns to the voltage source
True
Kirchffs law states In a series circuit, the sum of the voltage drops across all of the resistors will equal the applied voltage.
True
No matter how many resistances there are in a series circuit, the sum of the voltages across all of the resistances equal the voltage of the source according to the law of proprtion.
True
Resistance opposes the flow of electrons. In a series cicuit, the total cicuit resistance is equal to the sum of all the resistances in series
True
The current of the circuit can be determined by the formula I-E/R
True
The opposition to current flow results in a voltage drop of the circuit voltage.
True
To determine the resistance of each resistive element in the circuit, use the formula R=E^2/P. E is the rated voltage of the resistor, and P is the rated power of the resistor.
True
the total resistance of a parallel circuit can be calculated by the ____ method
equal resistance, productoversum, or reciprocal work
according to the equal resistance methd, when all the resistances of the oarallel circuit have the same resistance, divide the resistance of one element byt he largest element
false
in a parallel circuit the total circuit resistance is always greater than the smallest resustance
false
multiwire circuits have more conductors for a givn number of circuits which requires the use of a larger raceway
false
because of the dangers associated with an open neutral conductor,the continuity of the _____ conductor cannot depend upon the receptacle
grounded
improper wiring of muktiwire can cause _____ connected to the circuit
overloading of neutral and destruction of equipment
a ______ circuit that contains some resistances in parallel and some in series
series parallel circuit
For practical purposes, series circuits are often used for _____ applications,.
signal and control
Kirchoffs laws In a series circuit, the current is _______ thriugh the transformer, conductors, and appliance
the same
According to kirchoffs law, the total current provded by the source to a parallel circuit will equa the sum of the currents of all of the resistors in parallel
true
In a paralel circuit, the voltage drops across each resistance is equal to the sum of the voltage drops of each of the resistors in parallel
true
a muktiwire circuit has two or more ungrounded conductors having potential difference between them and having an equal difference of potential between each ungrounded conductor and the neutral conductor
true
if the current in each ungrounded conductor of a muktiwire circuit is the same the neutral conductor will carry 0A
true
if the ungrounded conductors of a muktiwire circuit are not terminated to different ohases , this can cause neutral current to be in excess of the rating
true
that portion of the series parallel circuit that contains resistances in parallel must follow rules of parallel circuits
true
that portion of the series parallel circuit that contains resistances in series must follow rules of series circuits
true
the advantage of the reciprocal method is tha formula can do as many the parallel curcuit contains
true
the current flowng on the neutral conductor of a muktiwire circuit is called unbalanced current
true
the neutral conductor of a 3 wire single phase circuit will only carry the unbalanced current when the circuit is nit balanced
true
the neutral conductor of a 3wire single phase circuit only carries current when the current on the ungronded conductors is nit identical
true
when power supplies are connected in parallel the voltage remains the same , but the current or amp hour increases
true
when working with series parallel circuits, it is best to redraw the circuit to see both
true
