Which one of the following is a list of devices from least efficient to most efficient

a. light-bulb, automobile engine, power plant, electric motor
b. home oil furnace, light bulb, electric motor, automobile
c. power plant (thermal), automobile engine, light-bulb (fluorescent), light-bulb (incandescent)
d. power plant (thermal), automobile engine, light-bulb (incandescent), light-bulb(fluorescent)

Consider a 1.2 meter high and 2 meter wide glass window whose thickness is 6 mm and thermal conductivity is 0.78 w/m °c. the room temperature is maintained at 24 °c, while the outdoor temperature is -5 °c. the convective heat transfer coefficients on the inner and outer surfaces of the window are 10 w/m2 °c and 25 w/m2 °c respectively. (a) draw the thermal resistance network, etermine the steady rate of heat transfer t e glass window (c) determine the temperature of the inner surface of the window