5. First, we connect a heater ( R ) to a battery of voltage ( emf), V1 . The heater uses 100.0 W of power. Next we remove V1 and connect the same heater to a new battery of voltage, V2 . The heater now uses 80.0 W of power. PF loo w P1: 80\"] W R R 4- _ + - V. V: Finally, we connect the heater to the series combination of the two batteries. R + . + - HP" V| V1- Calculate the total power used, P12 , by the heater in this last circuit. You should get a number