1.) A 930 W bulb and a 465 W bulb are bothdesigned to operate at standard householdvoltage of 120 V.Determine which bulb has the lower fila-ment resistance and then calculate the valueof its resistance.Answer in units of ?.2.)The resistivity of Nichrome is 1.5×10^?6 ?·m.Calculate the resistance per unit lengthof a Nichrome wire, which has a radius of0.185 mm.Answer in units of ?/m.If a potential difference of 28 V is maintainedacross a 2.3 m length of the Nichrome wire,what is the current in the wire?Answer in units of A.3.)Birds resting on high-voltage power lines area common sight. The copper wire on which abird stands is 1.92 cm in diameter and carriesa current of 99 A.Coppers resistivity is 1.68 × 10^?8 m.If the birds feet are 9.88 cm apart, what isthe potential difference across its body?Answer in units of ?V.4.)A current of 5 A flows in a copper wire 10 mmin diameter. The density of valence electronsin copper is roughly 9 × 10^28 m?3.Find the drift speed of these electrons.Answer in units of m/s.
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