A hair dryer draws 9.0 A. If it takes 12 min to dry your hair, how many electrons have gone through the circuit of the dryer?

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Since an electron has a charge of 1.6e-19C, in 1 C there are 1/1.6e-19 electrons = 6.25e18 electrons per coulomb
9A = 9C/s and 12min is 12*60s =720s so
9C/s *720s * 6.25e18 electrons/C = 4.05e22 = 4.05 x 10²² electrons
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