Basic Automotive Electrical Circuits
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What are the 5 basic electrical circuits fin automotive electrical systems? - ✔✔1.
Charging circuit
2. Starting
3. Ignition
4. Lighting
5. Accessory
Which circuit supplies all of the electricity for a vehicle whenever the engine is running?
- ✔✔The charging circuit
What are the 4 basic parts of a charging circuit? - ✔✔1. Batter
2. Alternator (generator)
3. Alternator Belt
4. Voltage regulator
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,What is the usual type of battery used in automotive equipment? - ✔✔A lead-acid cell-
type battery
How many batter elements are there in most automotive batteries? - ✔✔6
What are the active materials which compose the charged negative and positive plates
in each battery cell compartment? - ✔✔Charged negative plates contain gray colored
porous or spongy lead (Pb); Charged positive plates contain chocolate-brown colored
lead peroxide PbO2
What color of paint is used to mark a positive battery terminal? - ✔✔Red
What is the composition of the electrolyte solution used in a fully charged battery? -
✔✔60% water and 40% sulfuric acid
What is the normal specific gravity of the electrolyte used in a fully charged lead-acid
storage batter? - ✔✔1.28 (at 80F)
What is the unit of measurement for the capacity of a battery? - ✔✔Ampere-hour
What is the cold-cranking rating of a car battery? - ✔✔It shows how much current (in
amperes) the battery can deliver for 30 seconds at 0 degrees F while a terminal voltage
for 7.2 volts is maintained
What are the 2 principal methods used for charging a battery? - ✔✔The constant current
method and the constant voltage method
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, What is the usual charging rate using the constant current charging method? - ✔✔1
ampere per positive cell
When mixing electrolyte, should the water be poured into the acid, or acid into water? -
✔✔The acid is ALWAYS poured into the water slowly and gently: Pouring water into
sulfuric acid can cause an explosion or splattering
What type of water should be used to fill battery cells when the electrolyte level is low?
- ✔✔Distilled water only
What should battery terminals be coated with when reinstalling battery cables? -
✔✔Petroleum or white grease, in order to keep acid fumes off of the connections and
thus prevent corrosion
What should the hydrometer reading indicate for a fully charged battery? - ✔✔1.265 or
higher
What are the 3 basic types of hydrometers used to check the specific gravity of
batteries? - ✔✔1. Float
2. Ball
3. Needle
What reading indicates a bad battery which must be replaced using the cell voltage test?
- ✔✔Any reading on 1 or more cells which is 0.2 volts or more lower than the other cells
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Exam Questions and Answers 100%
Pass
What are the 5 basic electrical circuits fin automotive electrical systems? - ✔✔1.
Charging circuit
2. Starting
3. Ignition
4. Lighting
5. Accessory
Which circuit supplies all of the electricity for a vehicle whenever the engine is running?
- ✔✔The charging circuit
What are the 4 basic parts of a charging circuit? - ✔✔1. Batter
2. Alternator (generator)
3. Alternator Belt
4. Voltage regulator
Disclaimer: Original Content, No Copyright Infringement, All Rights Reserved © 2025 1
,What is the usual type of battery used in automotive equipment? - ✔✔A lead-acid cell-
type battery
How many batter elements are there in most automotive batteries? - ✔✔6
What are the active materials which compose the charged negative and positive plates
in each battery cell compartment? - ✔✔Charged negative plates contain gray colored
porous or spongy lead (Pb); Charged positive plates contain chocolate-brown colored
lead peroxide PbO2
What color of paint is used to mark a positive battery terminal? - ✔✔Red
What is the composition of the electrolyte solution used in a fully charged battery? -
✔✔60% water and 40% sulfuric acid
What is the normal specific gravity of the electrolyte used in a fully charged lead-acid
storage batter? - ✔✔1.28 (at 80F)
What is the unit of measurement for the capacity of a battery? - ✔✔Ampere-hour
What is the cold-cranking rating of a car battery? - ✔✔It shows how much current (in
amperes) the battery can deliver for 30 seconds at 0 degrees F while a terminal voltage
for 7.2 volts is maintained
What are the 2 principal methods used for charging a battery? - ✔✔The constant current
method and the constant voltage method
Disclaimer: Original Content, No Copyright Infringement, All Rights Reserved © 2025 2
, What is the usual charging rate using the constant current charging method? - ✔✔1
ampere per positive cell
When mixing electrolyte, should the water be poured into the acid, or acid into water? -
✔✔The acid is ALWAYS poured into the water slowly and gently: Pouring water into
sulfuric acid can cause an explosion or splattering
What type of water should be used to fill battery cells when the electrolyte level is low?
- ✔✔Distilled water only
What should battery terminals be coated with when reinstalling battery cables? -
✔✔Petroleum or white grease, in order to keep acid fumes off of the connections and
thus prevent corrosion
What should the hydrometer reading indicate for a fully charged battery? - ✔✔1.265 or
higher
What are the 3 basic types of hydrometers used to check the specific gravity of
batteries? - ✔✔1. Float
2. Ball
3. Needle
What reading indicates a bad battery which must be replaced using the cell voltage test?
- ✔✔Any reading on 1 or more cells which is 0.2 volts or more lower than the other cells
Disclaimer: Original Content, No Copyright Infringement, All Rights Reserved © 2025 3
