[填空题]
Electric energy units aye,h)bfe6 kxpan: j7* re often expressed in the form of “ki8zjx,ags ea/ )lowatt-hours.”
(a) Show that one kilowatt-hour (kWh) is equal to $3.6\times10^6$J
(b) If a typical family of four uses electric energy at an average rate of 520 W, how many kWh would their electric bill be for one month $\approx$ kW*h
(c) how many joules would this be?$a\times10^b$ J a = b =
(d) At a cost of 0.12 dollars per kWh, what would their monthly bill be in dollars? Does the monthly bill depend on the rate at which they use the electric energy? dollars
