ESCO Electrical Certification Exam - Questions and Answers

ESCO Electrical Certification Exam - Questions and Answers What is current flow? The flow of electrons in a circuit. What is impedance? opposition to alternating currents Like charges will Repel each other Any material that will readily release electrons is called Conductor Symbol for current I (amps) Electricity can produce: All the above: light, heat, magnetism The safety ground conductor is usually colored: Green An electron has a ____ negative charge Which of the following materials would be best suited for use as a semi-conductor? Silicon Which of the following meters must use internal power to check a load or circuit? Ohmmeter What would be the result if a 24 volt, 20 ohm contactor coil was wired in series with a 24 volt, 200 ohm control relay? Only the control relay would operate Three defrost heaters, each 15 ohms, are wired in parallel to a 120 volt power supply. How many Watts are consumed? 2880 When testing a capacitor with an analog or digital ohmmeter, the meter should: Measure low resistance then return to a high reading. How much resistance must be placed in a 120 volt circuit to limit the current to 2 amps? 60 ohms What is resistance? opposition to electron flow In electrical wiring, a black colored wire indicates A hot conductor How many watts are used by a heater operating on 460 volts and drawing 5 amps? 2300 How are fuses sized? A: By amperage B: By microfarads C: By voltage D: Both a and c What is generally considered the maximum allowable supply voltage variation? 5% Capacitors are rated in ___. By both their microfarad capacity and their voltage limit What is the term used to describe the output side of a transformer? Secondary side One horsepower is equal to ______ watts. 746 watts A parallel circuit contains an 18 ohm and a 9 ohm resistor. What is the total resistance? 6 ohms. In a series circuit, the voltage drop across each load will: Add up to equal the source voltage Which of the following is equal to 2.1kW? 2100 watts A capacitor analyzer is designed to check: The capacitance of the capacitor. On an electronic oil safety switch, what changes the pressure signal to an electrical signal? Transducer