HVAC Excellence - ELECTRICITY Exam Questions and Answers, 2024 A+

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.