Tom Henry Flashcards
An alternation is
one-half cycle
__________ Is the ability of a material to permit the flow of electrons
Conductance
What is the opposite of resistance
Conductance
Readily accessable
The ability to touch
Concealed
Buried in a wall
In wire 1 H indicates
75deg C
In wire 2 H’s indicates
90deg C
60 cycle frequency travels 180 degrees in how many seconds
1/120
The total opposition to the current flow in an AC circuit is expressed in ohms and is called
Impedance
What is the symbol for impedance
the letter Z
What is a short circuit
A very low resistance between the circuit conductors
Materials containing numerous free electrons are
good conductors
How many VA are required per sq foot in a house
3va
An AC ammeter or voltmeter is calibrated to read RMS values, this means the meter is reading the _______value
Effective
Electric current is measured in terms of
Electrons passing a point per second
An overcurrent protective devise with a circuit opening fusible part that is heated and severed by the passage of overcorrect through it is called a
Fuse
A fixture that weighs more than _______ lb shall be supported independently of the outlet box
50lb
Voltage drop in a wire is
A percentage of the applied voltage
Electric power (watts) is a measure of
A rate at which work is performed
The electric pressure of a circuit is __________
Voltage
What percentage of the maximum (peak) voltage is the effective (RMS) voltage
70.0%
In an AC circuit the ratio of the power in watts to the total volt-amps is called
Power factor
