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問題一覧
1
What is the most important law applicable to the study of electricity ?
Ohm's Law
2
What are the elements of ohms law ?
Voltage (E), current (I), and resistance (R)
3
What are the sources of electrical power ?
Mechanical, chemical, light and thermal
4
What does an electrical circuit consist of ?
source, resistance and conductors
5
What represents capacitance in an AC circuit?
A capacitor (condenser)
6
What is the function of a capacitor?
To store electricity.
7
What is inductance?
A voltage that is induced in a coil in an AC circuit
8
What is impedance?
A combined effect of resistance, inductive reactance, and capacitive reactance in an AC circuit.
9
What is the unit of measurement of power in a DC circuit ?
Watt
10
What is a Killowatt?
1000 watts
11
In a DC circuit what occurs when voltage is increased while resistance remains constant ?
There will be an increase in current.
12
What are three types of DC electrical circuits ?
Series, parallel, and series-parallel.
13
A 24-volt lead-acid battery has how many cells?
12
14
What should be the specific gravity of the electrolyte in a fully charged lead acid battery ?
It should be between 1.275 and 1.300
15
What instrument is used to determine the specific gravity of electrolyte in a lead acid battery?
Hydrometer
16
Why can't a hydrometer be used to determine the charge of a nickel cadmium battery ?
The gravity of the electrolyte in a nickel cadmium battery does not change appreciably during charge or discharge of the battery
17
When using a hydrometer to check the charge of a lead-acid battery, at what temperatures must a correction factor be applied to the reading?
above 90°F or below 70°F
18
What is electromagnetic induction ?
transfer of electrical energy by means of a magnetic field
19
How are battery compartments protected against corrosion?
coated with special corrosion resistant paint
20
What should be the correct electrolyte level in a properly serviced battery ?
3/8 inches above the plates
21
Why should nickel-cadmium batteries and lead-acid batteries not be stored or serviced in the same area?
The electrolyte & fumes from Lead-Acid batteries can contaminate the electrolyte in the Nickel-Cadmium battery.