A resistor is connected to an ideal ac power supply

(a) The phase angle between the current and voltage is
A) 0
B) ?/2 radians.
C) -?/2 radians.
D) ? radians.
E) 3?/4 radians.
(b) The current in the resistor
A) leads the voltage across the resistor by 90°.
B) lags the voltage across the resistor by 90°.
C) is in phase with the voltage across the resistor.
D) the voltage across the resistor by 45°.
E) lags the voltage across the resistor by 45°.
(c) How does the average power dissipated in the resistor change as the frequency in the ac power supply decreases?
A) It decreases.
B) It increases.
C) It does not change.
D) It increases or decreases depending on the sign of the phase angle.


(a) A (b) C (c) C

Physics & Space Science

You might also like to view...

Bulk Modulus: A piece of iron sinks to the bottom of a lake where the pressure is 21 times what it is at the surface. Which statement best describes what happens to the density of that piece of iron?

A. There has been no change in the density of the iron. B. Its density decreases slightly. C. Its density increases slightly. D. Its density becomes 21 times greater than what it was at the surface. E. Its density becomes 1/21 what it was at the surface.

Physics & Space Science

Compton Scattering: A 140-keV photon strikes an electron and scatters through an angle of 120° from its original direction. (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)(a) What is the wavelength of the photon before scattering?(b) What is the photon wavelength after scattering?

What will be an ideal response?

Physics & Space Science

Parallel-Plate Capacitor: The potential difference between the plates of an ideal air-filled parallel-plate capacitor with a plate separation of 6.0 cm is 60 V. What is the strength of the electric field between the plates of this capacitor?

A. 60 V/m B. 500 V/m C. 1000 V/m D. 2000 V/m E. 3600 V/m

Physics & Space Science

Why is ten million degrees critical to the proton-proton cycle?

What will be an ideal response?

Physics & Space Science