HVAC Excellence - ELECTRICITY Exam Questions and Answers Already Passed

HVAC Excellence - ELECTRICITY Exam Questions and Answers Already Passed Current flow is: The flow of electrons in the circuit. Impedance is: Opposition to alternating current flow. Like charges; repel each other. Any material that will readily release electrons is called; A conductor The symbol for current is; I Which of the following materials would be best suited for use as a semi-conductor? silicon The safety ground conductor is usually color coded; green or bare. An electron has; a negative charge. Resistance is: Opposition to current flow. How many watts of power are used by a heater operating at 240 volts and drawing 5 amps? 1200 watts Which of the following meters must use its internal power to check a load or circuit? Ohmmeter In electrical wiring, a black colored wire in an alternating current circuit usually indicates; the hot conductor. Fuses are sized by: Volts & Amps What would be the result, if a 24 volt, 20-ohm low voltage conta ctor coil were wired in series with a 24 volt, 200-ohm control relay coil? 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 of power will be used? 2880 Watts Which of the following is generally considered to be within the maximum allowable (plus or minus) supply voltage variation? 5% Capacitors are rated in Microfarads & Volts. When testing a capacitor with an analog or digital ohmmeter, the meter should; measure low resistance then return to high reading. What is the term used to describe the output side of a transformer? Secondary side. One horsepower is equal to __________ watts. 746 How much resistance must be placed in a 120 volt circuit in order to limit the current to 2 amps? 60 Ohms A parallel circuit contains a 18 ohm and a 9 ohm resistor. The total resistance equals; 6 ohms. In a series circuit, the voltage drop across each resistance (load) will. add up to equal the source voltage. The total resistance of a parallel circuit will be; less than the smallest resistance. Which of the following statements about current