A battery is used to light a bulb run a fan and heat an electric iron in case of a power failure. If
each of the above systems has 100 W rating and is run for 15 minutes what are the work done (W) and heat transferred (Q) by the battery?
(a) W = 90 kJ and Q -= 90 kJ
(b) W= 180 kJ and Q= 0
(c) W = 270 kJ and Q = 0
(d) W = 90kJ and Q = 180 kJ