IEC Lesson 104 HW Questions and Answers with complete solution

A particular load is rated to use 2.2 KW at 240 volts. This load is connected to a 2-pole breaker in a panel using 12 AWG conductors. How much current will this load draw? - 9.2 Opposite charges ___. - attract ___ force is the component of a circuit that causes electrons to flow. - Electromotive DC is an abbreviation for ___. - Direct Current Two particles that have opposite charges (one + and the other -) will ___ each other. - attract Current is measured in ___. - amperes In the international system of units, the prefix kilo- means ___. - thousand .0000001 A = ___ µA - .1 30 µA = ___ A - .00003 How would 13,800 volts be written in metric notation? - 13.8 kV If you can, you should back up a truck looking over ___ shoulder. - your left Before backing up a vehicle, you should ___. - walk around and scope out the area It is best to have a spotter on hand when backing a truck. - TrueIf you leave your trailer at the dock, be sure to chock its wheels. - True A particular load is rated to use 2.2 KW at 240 volts. If two of these loads are connected to the same circuit, the total circuit current is ___ that of one load. - double Electrical current is the flow of ___ - electrons What is the term for the electrical force that occurs when two charges have a difference in potential? - Electromotive force Which materials listed below are good conductors? I. copper II. air III. gold - I & III only Which materials listed below are good conductors? I. aluminum II. gold III. distilled water - I & II only ___ flow equals current flow. - Electron Which materials listed below are good insulators? I. copper II. air III. gold - II only Which of these symbols is used to represent a battery? -AC is an abbreviation for ___. - Alternating Current ____ is the force that causes current to flow - Voltage A heating element is rated to operate at 120 volts. A 3 KW element draws ___ amps at 120 volts - 25 For this question, assume that this is a 240-volt, single-phase installation. A 6,500 watt cooking range installed in a residence will draw ___ when operated at 240 volts. - 27 amperes .010005 A = ___ mA - 10.005 In the international system of units, the prefix milli- means ___. - one thousandth 105 mA = ___ A - .105 Electricians will use math each day in their profession. - True .0505 A = ___ mA - 50.5 Finding the least common denominator helps us ___. - Add fractions 23.5 V = ___ mV - 23,500 Interior walls of a residence consist of a 2 x 4 (3-1/2") with 1/2" drywall on both sides. Exterior walls are 2x6 (5-1/2") construction with 1/2" drywall on the interior and 7/16" sheeting with 3-5/8" brick on the exterior. Determine the outside dimension of a house if there are two interior rooms with an interior wall. One room dimension is 11' 3", Room 2 dimension is 15'7". - 28' 10-5/8" 1.705 V = ___ mV - 1,705.05 mV = ___ V - .00005