help with car audio installs

[Invigor]

i was thinkin the other day that my house wire at 110v is 14 guage and can handle 15amps...translated, that's like 1500watts of electricity. what I cannot understand is why amplifiers in cars needs like 4 guage at a minimum for say like 500watt amplifiers...sure 14.4volts into 500watts is 35amps, but is it absolutely necessary to have such huge wire??