Basic Jet Electrical Flashcards
What is the difference between A/C and D/C electricity and which is better ?
Which one kills you, amps or volts?
Amps but you need both. you need enough voltage (potential) to push the amps through your body. Welders have high amps, low volts, you can feel it, but it doesn’t have the potential to go through you
Your battery is XY amp/hours. What does that mean?
Amp-hour ratings measure a battery’s electrical capacity, similar to how you rate a bucket’s water capacity in gallons. These ratings can be expressed in different values as long as the product equals the total capacity. For example, a 20 amp-hour rated battery can discharge 20 amps of current for 1 hour. Rarely will you load this battery to the full 20 amps. So, more practical ways to express this are: 1 amp of current for 20 hrs; 5 amps for 4 hrs; 10 amps for 2 hrs; 6.66 amps for 3 hrs, etc. This is why it’s important to reduce electrical load (amps) when running on battery alone during an electrical system failure.
What is a KVA?
kilovolt-amp. kVA is a measure of the apparent power (what it’s capable of) output of the generator whereas watts are a measure of the real power (what you’re actually getting). In a DC system apparent and real power are equal (power factor = 1). In an AC system, real power (watts) are usually less than apparent power (VA) due to inefficient electricity transference.
What are the different types of batteries?
Lithium, Nicad, Lead
What are the disadvantages of a lead acid battery?
Voltage supplied tapers off the longer the battery is discharged
Why are modern jets mostly AC , not DC?
Engine generators more easily generate AC power, energy more easily transmitted over longer distances using smaller wires which means less weight, higher cycles (400 vs 60) of AC to DC is less disruptive to the human body
What are the advantages of a lead acid battery?
Cheaper than NiCad and not as susceptible to overheating as NiCad
What is generally powered by DC?
Battery
