[填空题]
Estimate the resistai;*a. oulnbvz4 m s 5m7hiy9d:n8skifi* ajoi2*r w 4:mce of the $120-V_{rms}$ circuits in your house as seen by the power company, when
(a) everything electrical is unplugged,
(b) there is a lone 75-W lightbulb burning. $\Omega$
