Electrical Practice Test Questions And Answers( Solved)

Electrical Practice Test Questions And Answers( Solved) What is current flow? - The flow of electrons in the circuit Current will _______ when voltage increases and resistance stays the same. - increase Will like charged particles will attract or repel each other? - Repel One kilowatt is equivalent to how many btus? - 3412 Electron flow is measured in? - amps A microamp is best expressed as _________ amps/of an amp - 1/1,000,000 of an amp What is the total resistance of an AC circuit, caused by inductive reactance, resis tance, and capacitive reactance called? - Impedance One horsepower is equal to? - 746 watts A millivolt is vest expresses as ______ of a volt. - 1/1000 Electrical resistance is measured in? - Ohms The _________ is that part of an atom that can move fro m one atom to another. - Electron The unit of measurement for the charge a capacitor can sore is the? - Microfarad An electron has a ____ charge. - negative What is impedance? - Opposition to alternating current flow How are fuses sized? - by amps and voltage Impedance in a circuit is the result of? - Pure resistance, inductive reactance, and capacitive reactance How much resistance must be in place in a 220 -volt circuit to limit the current to 2 amps? - 110 ohms Electrical power is measured in? - Watts If there were a current flowing of 5 amperes in 120 -volt circuit, what would the resistance be? - 24 ohms If the resistance in a 120 -volt circuit was 40 ohms, what would the current be in amperes? - 3 What is the formula for ohm's law? - I=E/R In a series circuit the current in each part of the circuit is ________. - the same When three resistors are connected in series the amount of voltage that is measured across each one is __________. - determined by the amo unt of current flowing through it and the amount of resistance it has The symbol used for electrical pressure is? - E On what type of an electrical circuit can Ohm's law be used? - a resistive circuit What is the total resistance of a circuit when a 5 o hm resistor, a 10 ohm resistor, and a 15 ohm resistor are wired in parallel with each other? - 2.73 Ohm's law is as follows: - I=E/R In a purely resistance load, if V=120 V and R=10 ohms, what is I? - 12 A If two 10 -ohm resistors are connected in series , what is the total resistance of these resistors? - 20 ohms what type of power is supplied to a residence? - Single phase AC What type of power is supplied to a residence? - 60 The hot wire of 120 volts will be? - Black A three wire romex cable will generally have a bare wire which is the? - Ground What color is the insulation on a ground wire? - Green Power coming into a residential home from the telephone pole will have how many wires? - Three The breaker in the serv ice box protects? - Wires from overheating The voltage at the secondary terminals of a ____________ transformer will be larger than the applied voltage to the primary terminals. - Step up If a control transformer has a 2:1 turns ratio and it has 220 volt s applied to its primary winding, the voltage to the primary terminals. - 110 volts