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33 Cards in this Set
- Front
- Back
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What are conductors?
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Materials that allow charges to flow through them easily
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What is dielectric strength?
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The insulating strength of a material
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What type of insulation is typically used on wires wound in coils?
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Varnish insulation
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What is the pressure of electricity?
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Voltage or electromotive force
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What is the opposition to EMF?
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Resistance
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What are 4 factors that determine resistance?
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Cross sectional area, length, material and temperature
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What are the 2 types of current?
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Alternating current and direct current
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How is power expressed?
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Watts
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What are the 3 basic circuit types?
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Series, parallel and series-parallel
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How is the total resistance determined in a series circuit?
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The sum of the individual resistances
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How would an open affect resistance?
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High resistance
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How would a short affect resistance?
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Low resistance
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What type of circuit faults have a potential to blow a fuse?
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Shorts
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What is ohms law?
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E=IxA
Volts = Ohms x Amps |
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How should resistance of a component be measured?
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Isolate the component
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How should voltage normally be measured?
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In parralel
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How is current measured?
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In series
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What is the reciprocal formula for finding resistance in a parallel circuit?
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1
_____________________= RT 1/R1 + 1/R2 + 1/R3 |
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What is the formula for power?
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Watts= voltage x current
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What is impedence?
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The resistance of a meter when connected to a circuit to measure voltage
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What does a reading of infinity suggest on an ohmmeter?
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Resistance is higher than the ohmmeter is capable of reading
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What is the open voltage of a fully charged battery?
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12.65V
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What is the open voltage of a 75% charged battery?
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12.45V
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What is the specific gravity of a fully charged battery?
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1.265 to 1.280
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What is the maximum allowable specific gravity variation of a battery?
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.050
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Why is the built in hydrometer not an accurate measurement of a batteries charge?
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It only measure one cell
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What is the best way to charge a battery?
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Slow charge
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What is the purpose of a trickle charger?
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Maintains the battery
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In what order should you connect the terminals when boosting a battery?
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Charged battery +, Discharged battery +, Charged battery -, discharged battery +
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What are the 3 functions of a battery?
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Absorbs voltage surges, Applies power to the starter motor, applies power to the accessories when the alternator cannot provide all the needed power
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What is the electrolyte made of in a lead acid battery?
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Sulphuric acid and water
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What does VRLA stand for?
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Valve regulated lead acid
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What is the minimum final voltage when performing a battery load test?
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9.6 V
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