285. A battery with a terminal voltage of 12.5 V is to be trickle-charged at a 0.5 A rate. What resistance should be connected in series with the battery to charge from a 110 V line?

The series resistance required to charge the battery at 0.5 A from a 110 V line is calculated by dividing the voltage difference (110 V — 12.5 V) by the desired current, resulting in 195 ohms.