1 Suppose a current carrying wire has a cross sectional area that gradually becomes smaller along the wire so that the wire has the shape of a very long truncated cone How does the drift speed vary along the wire 2 All electric devices are required to have identifying plates that specify their electrical characteristics The plate on a certain steam iron states that the iron carries a current of 6 00 A when connected to a source of 1 20 10 2 V What is the resistance of the steam iron 3 Suppose an electrical wire is replaced with one having every linear dimension doubled i e the length and radius have twice their original values The wire now haS 4 A voltage DV is applied across the ends of a Nichrome heater wire having a cross sectional area A and length L The same voltage is applied across the ends of a second Nichrome heater wire having a cross sectional area A and length 2L Which wire gets hotter 5 For the two resistors shown in the figure below rank the currents at points a through f from largest to smallest Ia Ib Ic Id Ie If 6 Two resistors A and B are connected in a series circuit with a battery The resistance of A is twice that of B Which resistor dissipates more power 7 The diameter of wire A is greater than the diameter of wire B but their lengths and resistivities are identical For a given voltage difference across the ends what is the relationship between PA and PB the dissipated power for wires A and B respectively PA PB
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