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trade terms
| 1. A meter that uses a needle to indicate a value on a scale is a | analog meter |
| 2. is the single operation of a switch, from one position to another. | throw |
| 3. A schematic drawing that indicates the path that electricity flows in a circuit is called a | circuit diagram |
| 4. is voltage measured across any load. | voltage drop |
| 5. A(n). is a circuit that consists of both a series and a parallel design. | series-parallel circuit |
| 6. A protective device that is placed directly in line with a voltage source is called a(n) | line-duty device |
| 7. is a measure of the number of cycles per second in AC electricity. | frequency |
| 8. A(n) _________is a control device consisting of a coil and one or more sets of contacts, used as a switching device in high-voltage circuits. | contactor |
| 9. The generation of an electrical current by a conductor placed in a magnetic field is called | induction |
| 10. is the unit of measure for power consumed by a load. | watts |
| 11. A type of short circuit caused by a live conductor touching another conducting substance is called a(n) | ground fault |
| 12. A(n) is a meter that provides a direct numerical reading of the value measured. | digital meter |
| 13. In AC electricity, a single repetition of alternating current flow is called | cycle |
| 14. A preselected temperature in a thermostatic switch that causes the switch to close when exceeded is called a(n) | set point |
| 15. is a term that refers to turning on an electric water heater with no water in the storage tank, causing the elements to burn out. | dry fire |
| 16. An electrical current that changes direction in cycles is called. | alternating current |
| 17. is the initial current surge in a compressor motor. | locked-rotor amps |
| 18. The normal running current of a compressor motor is called | full-load amps |
| 19. is the rate at which electrons flow in a circuit. | current |
| 20. An electrically heated element that, when exposed to water, quickly and efficiently transfers heat is called a(n) | immersion element |
| 21. is a measure of the electrical potential for current flow. | voltage |
| 22. A material that readily conducts electricity; also, the wire that connects components in an electrical circuit is called a(n) | conductor |
| 23. A(n) is a device that inhibits the flow of electrical current. | insulator |
| 24. An electrically operated switching device used to start large motors is called a(n) | magnetic starter |
| 25. A(n) is one end of magnetic flux lines, identified as either north or south. | pole |
| 26. A simplified schematic diagram in which the load lines are arranged like the rungs of a ladder between vertical lines representing the voltage source is called a(n) . | ladder diagram |
| 27. is an electrical current that flows in one direction. | direct current |
| 28. A device that converts AC voltage to DC voltage is called a(n) | rectifier |
| 29. are lines of force in magnetized iron. | magnetic flux lines |
| 30. The unit of measurement for electrical resistance is called | ohm |
| 31. A(n) is a circuit in which each load is connected directly to the voltage source. | parallel circuit |
| 32. A loop of electrical current that contains a voltage source, a load, and conductors is called a(n) | circuit |
| 33. A(n) is a test instrument capable of reading voltage, current, and resistance. | multimeter |
| 34. A pressure-sensing switch used to protect compressors is called a(n) | pressurestat |
| 35. A(n) is a magnetically-operated device consisting of a coil and one or more sets of contacts. | relay |
| 36. A protective device in which a wire coil opens an electric motor's contacts when the current rises above a preset level is called a(n) . | pilot-duty device |
| 37. A(n) is a circuit that provides a single path for current flow. | series circuit |
| 38. A device that converts electrical energy into another form of energy, such as heat, mechanical motion, or light is called a(n) | load |
| 39. The is the unit of measurement for current flow. The magnitude is determined by the number of electrons passing a point at a given time. | ampere |
| 40. A high current flow caused by a conductor bypassing the load is called a(n) . | short circuit |
| 41. is the amount of energy, measured in watts, consumed by an electrical load. | power |
| 42. An electromagnet that is used to raise or lower voltage is called a(n) . | transformer |
| 43. A(n) is a fuse with a built-in time delay. | slow-blow fuse |
| 44. A coil of wire wrapped around a soft iron core that creates magnetic flux lines when a current flows through the coil is called a(n) | electromagnet |
| 45. The is the unit of measurement for voltage. | volt |
| 46. An electromagnetic coil used to control a mechanical device is called a(n) | solenoid |
| 47. A(n) is a current-reading meter that is connected in series with the circuit under test. | in-line ammeter |
| 48. A current meter in which jaws placed around a conductor measure the amount of current flow is called a(n) | clamp-on ammeter |
| 49. A(n) is a test instrument used to measure current flow. | ammeter |
| 50. A continuous current path, indicating a closed circuit, is called | continuity |
| 51. is the opposition to current flow, such as in a load | resistance |
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