Identical lightbulbs are connected individually to four different ideal batteries that have emfs of 1.5 V, 3.0 V, 4.5 V, and 6.0 V, respectively. Assume the filament resistance of each bulb remains the same in all cases. Which battery–bulb combination will produce the greatest current through its bulb?
(a) The 3.0 V battery
(b) The 6.0 V battery
(c) The 4.5 V battery
(d) The 1.5 V battery