The total charge that an automobile battery can supply without being recharged is given in terms of ampere-hours. a typical 12-v battery has a rating of 49 a · h . suppose you forget to turn off the headlights in your parked automobile. if each of the two headlights draws 3.5 a , find out the time before your battery is "dead". answer in units of hours. answer in units of h

7 hours

Explanation:

The total charge contained in the battery is

And this is a charge, since it is a current multiplied by a time:

The current drawn by each headlight (which is the charge consumed per second) is

Since we have two headlight, the total current drawn is

Therefore, the total charge consumed by the two headlights each hour is

So, the time before the battery is dead is

continuous conducting path for current, power supply