Ch 2 Flashcards
(T/F) Smaller conductors have greater resistance and larger conductors have lower resistance
True
(T/F) According to the Conventional Current Flow Theory, a positive charge flows from positive to negative in the circuit
True
(T/F) Power is not equal to E x I for ac circuits because consideration must be given to inductive reactance
True
(T/F) Often the resistance of the power source and conductor are ignored in circuit calculations
True
What is the formula for input?
Input = Output / Efficiency
How would you find the reciprocal of 1.25?
1 / 1.25
The Ohm’s Law formula, I = E/R, states that current is _____ proportional to the voltage and ____ proportional to the resistance.
directly : inversely
Power in a circuit can be either “useful” or “wasted”. Wasted work is still energy used; therefore it must be paid for, so we call this “_______”
Power losses
Ohm’s Law demonstrates the relationship between circuit _____ (intensity, EMF, or resistance)
All of them
What is the Kw of a 75W load?
.075 kW
(T/F) Squaring a number means multiplying the number by itslef
True
In an ac circuit, the factors that oppose current flow are ______
resistance , inductive reactance, & capacitive reactance
The volume of an enclosure is expressed in ______
Cubic Inches
An electrical circuit consists of what three things?
Power Source : Conductors : Load
Put these conductors in their order for conductivity: Gold, silver, copper aluminum
Silver : Copper : Gold : Aluminum
(T/F) The work that ca be performed by moving electrons depends on the circuit pressure and the circuit’s opposition to the flow of electrons
True
According the the Electron Current Flow Theory, electrons leave the _____ terminal of the source, flow through the conductors and load(s) and return to the _____ terminal of the source
Negative : Positive
(T/F) The major advantage of ac over dc is the ease of voltage regulation by the use of a transformer
True
(T/F) The voltage applied to a resistor dramatically affects the power consumed by that resistor because power is affected in direct proportion to the voltage
False
(T/F) DC power is determined by multiplying the electromotive force by the circuit intensity
True
The method of increasing a number by another number is done by using a _______
Multiplier
Electrical pressure is called “______”, and it is measured in volts.
EMF or Potential
(T/F) Conductance is the property that permits current to flow
(T/F)
(T/F) Deriving the square root of a number is almost the same as squaring a number
False
(T/F) The polarity and the output voltage from a dc power source changes direction
False
How do you find the reciprocal of a number?
Turn that number into a decimal and divide it into the number 1
(T/F) According to the Electron Current Flow Theory, electrons flow away from the negative terminal of the source, through the circuit and load, toward the positive terminal of the source
True
In electrical systems, the volume of electrons that move through a conductor is called the “circuits _____”
Intensity
“______” is defined as the rate of work measured by the unit called the watt
Power
(T/F) Aluminum has lower resistance to the flow of electrons than does copper
False
to change a percent value to a decimal or whole number, drop the percentage sign and move the decimal point two places to the _______
Left
(T/F) Every component of an electrical circuit contains resistance, except the power supply.
False
The formulas in the formula wheel apply to ______
dc and ac circuits with unity power factor
