[填空题]
A heater coil connected zu 8,agila cfgb,g5,g 6)a:zsto a y,ep s; u7 8od) oomeq0qa-lv0$240-V_{rms}$ ac line has a resistance of $34\Omega$.
(a) What is the average power used? W
(b) What are the maximum and minimum values of the instantaneous power?
$P_{max}$ W
$P_{min}$ W