A car battery is rated at 90A hr, meaning that it can supply a 90A current for 1 hr before being completely discharged.

If you leave your headlights on until the battery is completely dead, how much charge leaves the positive terminal of the battery?

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To determine how much charge leaves the positive terminal of the battery, we need to calculate the total charge delivered by the battery.

First, we need to convert the battery's capacity from Amp-hours (A hr) to Coulombs (C). The conversion factor is 1 A hr = 3600 C.

Given that the battery is rated at 90 A hr, we can calculate the total charge capacity as follows:

90 A hr * 3600 C/A hr = 324,000 C

Therefore, the battery has a total charge capacity of 324,000 Coulombs.

When you leave your headlights on until the battery is completely dead, it implies that the battery has delivered all of its charge. So, the amount of charge that leaves the positive terminal of the battery would be equal to its total charge capacity.

Therefore, the charge that leaves the positive terminal of the battery when fully discharged is 324,000 Coulombs.