Answer
(a) $0.65A$
(b) $2.46\times 10^{-12}s$
Work Step by Step
(a) We know that
$P=VI$
This can be rearranged as:
$I=\frac{P}{V}$
We plug in the known values to obtain:
$I=\frac{780}{120}$
$I=0.65A$
(b) As $I=\frac{Q}{t}$
This can be rearranged as:
$t=\frac{Q}{I}$
We plug in the known values to obtain:
$t=\frac{1.6\times 10^{-12}}{0.65}$
$t=2.46\times 10^{-12}s$
