A&P General Practice Questions and Correct Answers

What is inductance? induced voltage which is opposite in direction to the applied voltage What causes opposition to the flow of applied current in ac circuits? inductive reactance and capacitance reactance What is the function of a capacitor? to store energy in a circuit (reservoir of energy) What are elements of ohms law? current, voltage and resistance How many watts equal one kilowatt? 1,000 What are 3 types of dc electrical circuits? series, parallel, series-parallel What current changes occur in a dc circuit when the applied voltage is increased and the resistance remains constant? current increases What should be the specific gravity of the electrolyte in a fully charged lead acid battery? 1.275-1.300 What unit is used to measure power in dc circuits? watt How many cells make up a lead acid battery rated at 24 volts? 12 cells Define the term impedance total opposition to flow of current in a circuit What is the effect of temperature on specific gravity of the electrolyte when checking a lead-acid battery? temperature only changes electrolyte density only when greater than 90 degrees f or less than 70 degrees f What are the functions of most multimeters? they indicate volts, amps, and ohms Some advantages of ac over dc 1) can be transmitted over longer distances easier 2) saves space and weight 3) circuit breakers work well at altitudes 4) devices are smaller and simpler 5) most 24-volt a/c systems have a special requirement for 400 cycle ac current 6) easily stepped up or down