A hair dryer draws 7.0 A when plugged into a 120-V line. What is its resistance? How much charge passes through it in 12 min (Assume direct current)?

Answer 1

R = V / I

= 120 / 7

= 17.14 ohms

Amount of charge, Q = I x t

= 7 x 12 x 60 [converting into seconds as current, I is Coulomb (C) per second]

= 5040 C