A coil of Nichrome wire is 22.0 m long. The wire has a diameter of 0.350 mm and is at 20.0°C. (a) If it carries a current of 0.400 A, what is the magnitude of the electric field in the wire? V/m (b) If it carries a current of 0.400 A, what is the power delivered to it? W (c) If the temperature is increased to 360ºC and the potential difference across the wire remains constant, what is the power delivered? W

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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.