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ORAL General Basic Electricity
Terms in this set (20)
What is inductance?
Induced voltage which is opposite in direction to the applied voltage.
What represents capacitance in A.C. circuits?
Why should nickel-cadmium batteries and lead-acid batteries not be stored or serviced in the same area?
The electrolyte in nickel-cadmium batteries is chemically opposite to the lead-acid battery electrolyte and the fumes from lead-acid battery can contaminate the electrolyte in the nickel-cadmium batteries.
What is the most important law applicable to the study of electricity?
What causes opposition to the flow of applied current in an A.C. circuit?
Inductive reactance and capacitance reactance.
What is the function of a capacitor?
It serves as a reservoir or storehouse for electricity.
What are the elements of Ohm's Law?
Voltage, current, and resistance.
How many cells make up a lead-acid battery rated at 24 volts?
12 cells (2 volts each)
How is Ohm's Law expressed as an equation?
E = I x R or I = E / R or R = E / I
What does an electrical circuit consist of?
A source of electrical pressure, resistance in the form of an energy-consuming device, and conductors in the form of wires to provide an electron flow.
What unit is used to measure power in D.C. circuits?
How many watts equal one kilowatt?
What are 3 types of D.C. electrical circuits?
Series, parallel, and series-parallel.
What could cause a nickel-cadmium battery to fail to deliver its rated capacity?
Cell imbalance or faulty cells.
What current changes occur in a D.C. circuit when the applied voltage is increased and the resistance remains constant?
The current increases.
What functions will most multi-meters perform?
They will read amperes, volts, and ohms.
What are some advantages of A.C. circuits over D.C. circuits in aircraft?
Alternating current can be transmitted over long distances more readily and more economically than direct current, since A.C. voltages can be increased or decreased by means of transformers.
What should be the specific gravity of the electrolyte in a fully charged lead-acid battery?
Specific gravity between 1.275 and 1.300.
What is the effect of temperature on specific gravity of the electrolyte when checking a lead-acid battery?
Battery temperature changes electrolyte density only when greater than 90F or less than 70F.
Why is specific gravity check of the electrolyte in a nickel-cadmium battery not acceptable to determine battery charge?
There is no appreciable change in the specific gravity of the electrolyte during charge or discharge.
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