A variable current flows through a $1\Omega$ resistor for 2 s. Time dependence of the current is shown in the graph 

Total charge $\int Idt=$ Area under the curve = 10 C

Average current $=\frac{{\displaystyle \int Idt}}{{\displaystyle \int dt}}=5A$

Total heat produced $\int I^{2}dt$

$\underset{0}{\overset{2}{\int }}{(-5t+10)}^{2}1dt=\frac{200}{3}J$

Maximum power $=I^{2}R$ when I is maximum current $=100\times 1=100W$