6. An inductor opposes an instantaneous change in its own voltage? 7. Xc is the AC opposition to current flow? 8. Xc grows smaller as the frequency is increased in a circuit 9. Inductor and capacitor currents are 360 degrees out of phase? 10. XL is the AC opposition to current flow? 11. The term impedance, applied to a circuit with capacitors and resistance is the phasor sum or result of the resistance and capacitive reactance.12. impedance z is defined as the total opposition to voltage in an AC circuit.13. The current always leads the voltage in a series resistor capacitor circuit by 45 degrees.15. When a sinusoid voltage is applied to an RC circuit, the current and all the voltage drops are also sine waves.16. Total current in an RC circuit always leads the source voltage.
An inductor opposes an instantaneous change in its own voltage? FALSE 7. Xc is the AC opposition to current flow? not entirely TRUE - Xc is one form of opposition to alternating current flow, but the total opposition to ac current is the impedance which is given the symbol Z. 8. Xc grows smaller as the frequency is increased in a circuit TRUE : Xc 1 / ( 2 π f C ) 9. Inductor and capacitor currents are 360 degrees out of phase? FALSE in a series circuit they are in phase with one another, in a parallel circuit the two currents are (approximately) in antiphase i.e. 180° out of phase 10. XL is the AC opposition to current flow? not entirely TRUE - XL is one form of opposition to alternating current flow, but the total opposition to ac current is the impedance which is given the symbol Z. 11. The term impedance, applied to a circuit with capacitors and resistance is the phasor sum or result of the resistance and capacitive reactance. More or less TRUE. In a series CR circuit the impedance is the phasor sum of capacitive reactance and resistance, but that is not true for a parallel connection. 12. impedance z is defined as the total opposition to voltage in an AC circuit. FALSE. Z is may be described as the total opposition to CURRENT flow, but that description is not really rigorous enough to constitute a formal definition. 13. The current always leads the voltage in a series resistor capacitor circuit by 45 degrees. FALSE It is only true if the resistance is EQUAL TO the capacitive reactance. 15. When a sinusoid voltage is applied to an RC circuit, the current and all the voltage drops are also sine waves. TRUE (provided that the sinusoidal voltage is the only applied voltage and adequate time has elapsed for any transients to decay to a negligible level) 16. Total current in an RC circuit always leads the source voltage. Only true if the source voltage is alternating. Not true if the applied voltage is a constant dc level.
