Flashcards in Ch 3 Deck (41)
In a parallel circuit, the total power is equal to what?
The sum of the branches' powers
What can happen if the neutral conductor of a multi-wire circuit is interrupted (opened)? Why?
Fire or destruction of equipment, because it can cause overvoltage or undervoltage of the electrical equipment.
The current flowing in the neutral conductor of a multi-wire circuit is called:
The neutral conductor of a 3-wire, 120/208V or 277/480V circuit from a 4-wire, three phase system will ______ carry neutral current
In a parallel circuit, the resistance total is _____ than the smallest individual resistance
This type of circuit is also called "Open-loop system"
What is the formula for the Product-Over-Sum Method?
Rt = (R1 x R2) / (R1 + R2)
This conductor is also called a "grounded conductor"
In a series circuit, what does the sum of the power consumed by all the resistors equal?
The total power consumed by the circuit
(Series or Parallel) Total power is equal to the sum of the branches' powers
The _______ conductor or a solidly grounded system is required to be grounded.
(Series or Parallel) Total resistance is less than the smallest individual resistance
Term for "connected to the Earth"
Because of the dangers of an open neutral conductor, what does the NEC require in a multi-wire circuit?
That the neutral be spliced and brought out to the device. This way if the device is removed, it does not result in an open neutral conductor.
Circuit consisting of two or more ungrounded conductors that have a voltage between them, and an equal voltage between each ungrounded conductor
Current is identical through all circuit elements in this type of circuit
In a 3-wire 120/240V, single-phase circuit, the current flowing on the neutral will be what?
The difference between the current on the ungrounded conductors
When power supplies are connected in series, the voltage of the power supply will be ________
(Series or Parallel) The sum of the currents through each path is equal to the total current that flows from the source
In a parallel circuit, voltage is ____ across each component of the parallel circuit?
In a parallel circuit, the sum of the currents through each path is equal to what?
The total current that flows from the power source
In a multi-wire branch circuit, what could cause the neutral to become overloaded with current and damage the insulation?
Not terminating the ungrounded conductors to separate phases
(Series or Parallel) Current is constant
(Series or Parallel) Total resistance of a series circuit is equal to the sum of all of the resistances of the circuit
What is the formula for the Reciprocal Mehtod?
Rt = 1 /(1 /R1, + 1/R2, + 1/R3......)
If the circuit is balanced and the current flow on each line of the circuit is the same, how much current will the neutral conductor carry?
(Series or Parallel) Has two or more paths for current to flow through
In a 2-wire circuit, the _____ flowing on the neutral will be the same as the ______ on the ungrounded conductors.
This type of circuit is also called a "closed-loop system"