Electrical Systems Exam 1 questions 100% correct answers

Amp - correct answers the measurement of electric current or flow of electrons Volt - correct answers the measurement of electromotive force or potential difference Ohm - correct answers the measurement of resistance to the flow of electricity Watt - correct answers the measurement of energy used per unit of time Power vs Energy - correct answers power is the rate of consuming energy at a specific moment Energy = power * time Ohms Law - correct answers V = I * R V = Volts I = Amps R = Ohms Resistor - correct answers an electrical component that resists the flow of circuits Kirchhoff's 1st law - correct answers the sum of the currents entering any junction must equal the sum of the currents leaving that junction current (Amp) - correct answers is the constant in a series circuit True - correct answers The sum of the currents through each path is equal to the total current that flows from the source Kirchhoff's 2nd law - correct answers The sum of the potential differences (voltage drops) across all elements around any loop must be zero True - correct answers The voltage drop across a resistor is proportional to the size of the resistor. Frequency - correct answers the number of cycles per second Frequency of the US - correct answers 60 cycles per second or 60 Hertz UK = 50 Hertz Ac vs Dc - correct answers Dc = volts * amps Ac does not = volts * amps In AC not all of the Power is being used at 100% efficiency, some of the power is wasted! Power Factor - correct answers the measurement of the frequency of the power being used low PF - correct answers buildings below 0.95 PF are considered low Inductor - correct answers coil of a wire that creates electromagnetic field capacitor - correct answers metal plates separated by air that store up electrical energy Apparent Power - correct answers power available to use Real (working) Power - correct answers the power that actually does work Reactive Power - correct answers garbage power, no work done Why Ac over Dc? - correct answers cheaper modify voltage Two principles key to a transformer - correct answers Electromagnetism Electromagnetism induction Step up/step down transformer - correct answers up has less coils than down Hot wire - correct answers the conductor providing volts Neutral wire - correct answers provides return path for volts Single-phase - correct answers used in residential and small commercial adequate for running motors about 5 horsepower Three-phase - correct answers used in large commercial buildings uses less conductor material for same amount of power as single phase 3 hot wire 1 neutral Benefits of three-phase - correct answers costs less to transport