Electrical Elements Flashcards
(158 cards)
What does a wire gauge represent?
the diameter of the entire wire, bigger gauge number, smaller diameter and vice versa
What are the common gauge numbers used in households?
10AWG - 5.261mm^2
12AWG - 3.309mm^2
14AWG - 2.081mm^2
Superconductor is also known as?
Cryogenic conductor
What material is the best conductor of electricity?
Silver, due to most number of free electrons per unit volume
which metals are the best conductors of electricity
Pure silver
Pure copper
Pure gold
Aluminum
What are wire-wound resistors?
Uses metal alloys that are independent of temperature like manganin and constantan, and have an inductive property
What are thin film resistors
Deposited thin metal(Ceramic Metal) on an insulating support, Has High Resistance, Has no Reactive property
What are carbon composition resistors?
low wattage fixed type made from carbon, Its size is proportional to the power it can handle
What is a rheostat?
variable resistor with only two terminals, used in high power and high voltage, wire-wound(has inductive property)
What is potentiometer
variable resistor used for low power and low current application, has 3 terminals
Resistors color code
1st significant, Second Significant, multiplier, tolerance,
Black Black 0 Boys Brown 1 Respect Red 2 Our Orange 3 Young Yellow 4 Girl Green 5 But BLue 6 Violeta Violet 7 Goes Gray 8 White White 9
What does the reliability (5th) band in a resistor indicate?
Reliability (in percent of failure per 1000 hours of use)
It is the fundamental source of electrical energy developed through the conversion of chemical or solar energy
Cell
Combination of two or more cells
Battery
These are not rechargeable cells, AND DO NOT HAVE RESISTANCE
Primary Cell
These are rechargeable cells AND HAVE RESISTANCE
Secondary Cells
Two common rechargeable cells
Lead-Acid used in automobiles
Nickel-Cadmium used in calculators/tools/photoflash units
Carbon-zinc (Leclanche): Classification and output voltage
Primary/1.5V designed for 70 degrees Farenheit operation
Zinc Chloride: Classification and output voltage
Primary/1.5V Heavy Duty type
Manganese Dioxide (alkaline): Classification and output voltage
Primary or Secondary/ 1.5V has low internal resistance
Mercuric Oxide: Classification and output voltage
Primary/1.35V
Silver Oxide: Classification and output voltage
Primary 1.5V
Lead Acid: Classification and output voltage
secondary 2.1V
Ni-Cd: Classification and output voltage
Secondary 1.25V