1. Explain in terms of electron motion and collision why (a) longer wires have more resistance; (b) wires with greater cross sectional area [thicker] have less resistance and (c) heating a wire increases its resistance 2. What happens to the electrical energy furnished by a battery to move a current through a resistor? 3. What is the resistance of a metal conductor through which a 6.0-V battery sends a current of 0,20 A? 4. A current of 0.40 A is flowing in a nichrome wire of resistance 25 S2. What potential difference is being applied to the wire? 5. A 110-V electric iron draws 3.0 A of current. How much electrical energy is supplied to it each hour? 6. What is the resistance of a Tungsten wire of cross sectional area, 0.002 m?, length 10 m, at a temperature of 20C? [See reference table]