A160 w lightbulb is plugged into a standard 120 v outlet.
(a) how much does it cost in dollars per 31-day month to leave the light turned on continuously? assume electrical energy costs us$ 0.06/kw. h.
(b) what is the resistance of the bulb? (c) what is the current in the bulb?

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)