zoomlogo's Website

for i in range(10):
    print(i)

DC Current is given by \$I\$, and its formula is: $$I=\frac Qt$$ However AC Current is denoted by \$i\$ (notice the case difference), and its formula is: $$i=\frac {dQ}{dt}$$ We also see: $$\frac d{dx}e^x=e^x$$