Technician a says when a battery is charging, it changes chemical energy into electrical energy. technician b
says when a battery is being discharged, it changes electrical energy into chemical energy. who is correct?
a. a only
c. both a and b
b. b only
d. neither a nor b

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