Question

A strong lightning bolt transfers about 25 c to earth. how many electrons are transferred? the elementary charge is 1.60218 × 10−19
c.

Answer 1

The total charge transferred is $Q=25 C$. This total charge consists of N electrons, each one with charge $e=1.6 \cdot 10^{-19}C$. To find N, the number of electrons transferred, we must simply divide the total charge by the charge of a single electron:
$N= \frac{Q}{e}= \frac{25 C}{1.6 \cdot 10^{-19}C}=1.56 \cdot 10^{20}$