2. An electric flat iron draws a current of 15 A when connected to a 110v line (a) Assuming that the heating element of the flat iron obeys Ohm's law, what is its resistance? (b) What is the resistivity of the heating element if it is a wire that is 2.5 cm long with cross-sectional area of 2x10 m??

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.