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IEC Test Study GuideHow big of an electric shock does it take disrupt the heart's electrical circuitry? -
answer30V
True or False?
To determine the resistance of each resistive element in the circuit, use the formula R =
E/P. E is the rated voltage of the resistor, and P is the rated power of the resistor. -
answerTrue
True or false?
To calculate the total resistance of the circuit: R, = R, + R, + Ry + ... - answerTrue
What formulae determines the current of the circuit? - answerI = Es/R,.
What formula determines the power of each resistor if you already the current of the
circuit? - answerP = I^2 x R
Direct Current - answerThe polarity and the output voltage from a de power source
never change direction. One terminal will be negative and the other will be positive,
relative to each other. Direct-current power is often produced by batteries, de
generators, and electronic power supplies.
Alternating Current - answerAlternating-current power sources produce voltage that
changes polarity and magnitude. Alternating current is produced by an ac power source
such as an ac generator. The major advantage of ac over de is the ease at which
voltage can be changed through the use of a transformer.
Conductance - answerConductance or conductivity is the property of a metal that
permits current to flow. The best conductors in order of their conductivity are: silver,
copper, gold, and aluminum.
Circuit Resistance - answerThe total resistance of a circuit inclades the resistance of the
power supply, the circuit wiring, and the load, Because the resistance of the power
source and conductor is so much smaller than that of the load, they are generally
ignored in circuit calculations.
Ohm's Law - answerthe current in a circuit equals the voltage difference divided by the
resistance
I=E/R
, Direct Current - answerIn a de circuit, the only opposition to current flow is the physical
resistance of the material through which the current flows.
Alternating Current - answerIn an ac circuit, there are three factors that oppose current
flow: the resistance of the material, the inductive reactance of the cir-cuit, and the
capacitive reactance of the circuit.
Ohm's Law Formula Circle - answerOhm's Law, the relationship between current,
voltage, and
resistance expressed in the formula, I = E/R, can be transposed to E = Ix R or R = E/.
Series circuits are often used for ____________
applications. - answerSignal & Control
Kirchoff's Current Law states, "In a series circuit, the current is ___________ through
the transformer, the conductors.
and the appliance." - answerThe same
True or False?
A 115/230V rated motor connected to a 230V circuit must have the windings connected
in series so that each winding will receive at least 230V. - answerFalse
True or False?
Resistance opposes the flow of electrons. In a series cir-cuit, the total circuit resistance
is equal to the sum of all of the resistances in series. - answerTrue
A ____________ is a circuit that contains some resistances in series and some
resistances in parallel with each other. - answerSeries-parallel circuit
True or False?
That portion of the series-parallel circuit that contains resistances in series must comply
with the rules for series circuits. - answerTrue
According to the /EEE Dictionary, a neutral conductor has the same equal potential
between it and all ungrounded
conductors of a _____________System. - answer3-wire or 4-wire
The _______________ conductor(s) of a solidly grounded system is required to be
grounded (connected to the earth). - answerNeutral
A 3-wire, 120/240V circuit from a three-phase delta transformer contains
____________. - answera grounded/ and two ungrounded conductors
The current on the grounded conductor of a 2-wire circuit IS ______________ of the
current on the ungrounded conductor. - answer100%
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