For the same 12V light left on for 13 hours at 1.5A, how many amp-hours (Ah) are used?

To determine the number of amp-hours (Ah) used by the light, you multiply the current flowing through the device in amps (A) by the duration of time it is on in hours (h). In this scenario, the light operates at a current of 1.5A for a duration of 13 hours.

The calculation is as follows:

1.5 A × 13 h = 19.5 Ah

This shows that the light consumes a total of 19.5 amp-hours of electricity during the 13 hours it is active. The concept of amp-hours is essential in understanding how much electrical capacity is required to power devices over time, which is a common consideration in solar power and other energy systems.

Hence, the correct answer is based on this straightforward calculation of electrical consumption.