Question

the power of 200 joules in 2 hours is:​

Answer 1

Change in energy by moving a single electron across an electric potential difference of one volt. 1 Electron volt (eV) = 1.602176565 x 10-19 joules (J).

Answer 2

$e = p \times t$

then convert hour in second

2×60×60 sec

7200sec

use formula

e=p×t

e = 200× 7200 joule sec

e = 1440000 joule sec

$e = 14.4 \times 10 {}^{5} joules \: sec$