Module 1 Alternating Current with correct answers 100%

Module 1 Alternating Current with correct answers 100% Capacitance - Correct Answer The storage of electricity in a capacitor; capacitance produces an opposition to voltage change. The unit of measurement for capacitance is the farad (F) or microfarad (µF) Frequency - Correct Answer The number of cycles an alternating electric current, sound wave, or vibrating object undergoes per second. Hertz (Hz) - Correct Answer A unit of frequency; one hertz equals one cycle per second. Impedance - Correct Answer The opposition to current flow in an AC circuit; impedance includes resistance (R), capacitive reactance (Xc), and inductive reactance (Xl). Impedance is measured in ohms (Ω). Inductance - Correct Answer The creation of a voltage due to a time-varying current; also, the opposition to current change, causing current changes to lag behind voltage changes. The unit of measure for inductance is the henry (H). Micro (µ) - Correct Answer Prefix designating one-millionth of a unit. For example, one microfarad is one-millionth of a farad. Peak voltage - Correct Answer The maximum voltage value, regardless of sign, of an alternating current. Radian - Correct Answer An angle at the center of a circle, subtending (opposite to) an arc of the circle that is equal in length to the radius. Reactance - Correct Answer The opposition to alternating current (AC) due to capacitance (Xc) and/or inductance (Xl) Root-means-square (rms) - Correct Answer The square root of the average of the square of the function taken throughout the period. The rms value of a sinusoidally varying voltage or current is the effective value of the voltage of current. Self-inducatance - Correct Answer A magnetic field induced in the conductor carrying the current. Average value = - Correct Answer 0.637 x peak value Value of rms = - Correct Answer 0.707 x peak value An electric current always produces _____. - Correct Answer A magnetic field The number of cycles an alternating electric current undergoes per second is known as ____. - Correct Answer Frequency What is the peak voltage in a circuit with an rms voltage of 120VAC? - Correct Answer 170 volts Which of the following conditions exist in a circuit of pure resistance? - Correct Answer The voltage and current are in phase In a purely resistive AC circuit where 240v is applied across a 10 ohm resistor, the amperage is ___. - Correct Answer 24A When the current increases in an AC circuit, what role does inductance play? - Correct Answer It reduces the current Which of the following coils is likely to show the lowest inductance? - Correct Answer A coil with a narrow core Which of the following conditions exist in a circuit of pure inductance? - Correct Answer The voltage and current are 90 degrees out of phase. Reactance increases with an increase in _____. - Correct Answer Inductance Capacitance is measured in ___. - Correct Answer Farads (F) The total capacitance of two 15µf capacitors connected in parallel is ___. - Correct Answer 30µF (Ct= 15µF+15µF=30µF)