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GENERAL ORALS
CHAPTER 3 - BASIC ELECTRICITY
| Question | Answer |
|---|---|
| ONE KILOWATT IS EQUAL TO HOW MANY WATTS? | 1,000 WATTS. |
| WHAT LAW DESCRIBES THE MOST FUNDAMENTAL OR BASIC RELATIONSHIPS IN AN ELECTRICAL CIRCUIT? | OHMS LAW. |
| WHAT ARE THE THREE ELEMENTS OF OHMS LAW? | VOLTAGE, CURRENT, AND RESISTANCE. NOTE: V = I X R |
| HOW WOULD YOU WRITE OHMS LAW AS AN EQUATION? | E = I X R, R = E / I, I = E / R |
| IF THE RESISTANCE IN A DC CIRCUIT REMAINS THE SAME BUT THE VOLTAGE DOUBLES, WHAT HAPPENS TO THE AMOUNT OF CURRENT FLOWING IN THE CIRCUIT? | IT ALSO DOUBLES. |
| IN DC CIRCUITS, WHAT UNIT MEASURES "POWER"? | WATTS (P) |
| WHAT THREE ELEMENTS ARE REQUIRED TO FORM AN ELECTRICAL CIRCUIT? | A SOURCE OR ELECTRICAL ENERGY, A LOAD OR RESISTANCE TO USE THE ELECTRICITY, AND WIRES OR CONDUCTORS TO CONNECT THE SOURCE TO THE LOAD. |
| DC CIRCUITS CAN TAKE ONE OF THREE FORMS OR TYPES. WHAT ARE THEY? | SERIES, PARALLEL, AND COMPLEX (SERIES-PARALLEL). |
| A 24-VOLT LEAD-ACID BATTERY HAS HOW MANY CELLS? | TWELVE (12), EACH CELL HAS 2.1 VOLTS. |
| A FULLY CHARGED LEAD-ACID BATTERY HAS A SPECIFIC GRAVITY THAT VARIES BETWEEN WHAT TWO VALUES? | 1.275 AND 1.3000. |
| YOU MUST APPLY A CORRECTION TO THE SPECIFIC GRAVITY READING OF THE ELECTROLYTE OF A LEAD-ACID BATTERY WHEN THE TEMPERATURE IS OUTSIDE OF WHAT TWO VALUES? | WHENEVER THE TEMPERATURE IS LESS THAN 70 DEGRESS FAHRENHEIT OR MORE THAN 90 DEGREES FAHRENHEIT. |
| WHAT IS THE REASON FOR HAVING SEPERATE FACILITIES FOR STORING AND SERVICING NICKEL-CADMIUM (NICAD) AND LEAD-ACID BATTERIES? | THE ELECTROLYTE IN THE TWO TYPES OF BATTERIES IS CHEMICALLY OPPOSITE AND THE FUMES FROM ONE TYPE CAN CONTAMINATE THE ELECTROLYTE OF THE OTHER TYPE. |
| THE STATE OF CHARGE OF A NICKEL-CADMIUM (NICAD) BATTERY CANNOT BE DETERMINED BY MEASURING THE SPECIFIC GRAVITY OF THE ELECTROLYTE FOR WHAT REASON? | THERE IS NO SIGNIFICANT CHANGE IN THE SPECIFIC GRAVITY OF THE ELECTROLYTE AS THE BATTERY IS CHARGED OR DISCHARGED. |
| WHAT IS THE PRINCIPLE ADVANTAGE OF AC CURRENT OVER DC CURRENT? | POWER CAN BE TRANSMITTED OVER LONG DISTANCES MORE EFFICIENTLY AND WITH SMALLER WIRES BECAUSE THE VOLTAGE CAN BE EASILY INCREASED OR DECREASED BY A TRANSFORMER. |
| WHAT ARE THE THREE CAUSES OF OPPOSITION TO CURRENT FLOW IN AN AC CIRCUIT? | RESISTNACE, INDUCTIVE REACTANCE, AND CAPACITIVE REACTANCE. |
| DEFINE INDUCTANCE. | AN INDUCED VOLTAGE WHICH IS OPPOSITE IN DIRECTION TO THE APPLIED VOLTAGE. |
| WHAT COMPONENT CREATES CAPACITANCE IN AC CIRCUITS? | A CAPACITOR. |
| HOW DOES A CAPACITOR STORE ELECTRICITY? | THE ENERGY IS STORED IN THE FORM OF AN ELECTROSTATIC CHARGE OR FIELD THAT EXIST BETWEEN TWO CONDUCTORS SEPARATED BY AN INSULATOR. |
| WHAT PROPERTY OF AN AC CIRCUIT IS DEFINED BY THE TERM "IMPEDANCE." | THE TOTAL OPPOSITION TO CURRENT FLOW. |
| WHAT ARE TWO REASONS THAT MIGHT CAUSE A NICKEL-CADMIUM (NIDCAD) BATTERY TO FAIL TO DELIVER ITS RATED CAPACITY? | FAULTY CELLS OR CELL IMBALANCE. |
| WHAT ELECTRICAL VALUES ARE MEASURED BY A TYPICAL MULTIMETER? | VOLATAGE, CURRENT, AND RESISTANCE. |
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brookburns34924
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