Question

When a 12.0 car battery power a single 30.0w headlight how many electrons pass through it each second

Answer 1

$P=VI\\30=12I\\I=2.5A\\But\ Q=It\\Q=2.5C\\$

Charge on one electron$=1.6×10^{-19}C\\$

Number of electrons

$=\frac{2.5}{1.6×10{-19}}\\ 1.5625×10^{19} electrons$