P = 100W

1 A*h = 3600 A*s (Coulombs), therefore:

Q = 288000 C

E = 12 V

For a battery, P=EI.

\(\displaystyle{I}=\triangle\frac{{Q}}{\triangle}{t}\)

Transposing these equations and solving for \(\displaystyle\triangle{t}\) the followingequation resolves:

\(\displaystyle\triangle{t}=\frac{{{E}\triangle{Q}}}{{P}}={34560}{s}={9.6}\) hours (So that's why theyhad it in A*h originally)

1 A*h = 3600 A*s (Coulombs), therefore:

Q = 288000 C

E = 12 V

For a battery, P=EI.

\(\displaystyle{I}=\triangle\frac{{Q}}{\triangle}{t}\)

Transposing these equations and solving for \(\displaystyle\triangle{t}\) the followingequation resolves:

\(\displaystyle\triangle{t}=\frac{{{E}\triangle{Q}}}{{P}}={34560}{s}={9.6}\) hours (So that's why theyhad it in A*h originally)