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Unformatted text preview: 21.38. Set Up: Example 21.10 shows that the inductance of a toroidal solenoid is Solve: 21.39. Set Up: Problem 21.37 shows that for a long solenoid Solve: 21.40. Set Up: A transformer transforms voltages according to The effective resistance of a secondary circuit of resistance R is and Solve: (a) (b) 21.41. Set Up: A transformer transforms voltages according to The effective resistance of a secondary circuit of resistance R is Resistance R is related to P and V by Conservation of energy requires so Solve: (a) and we want so use a stepdown transformer with (b) so (c) The resistance R of the blower is The effective resistance of the blower is Reflect: Energy is provided to the primary at the same rate that it is con sumed in the secondary. Stepdown transformers step up resistance and the current in the primary is less than the cur rent in the secondary. 21.42. Set Up: For an ideal transformer, Solve: (a) (b) (c) (d) so 21.43. Set Up: and Solve: (a) (b) (c) Reflect: Since the power supplied to the primary must equal the power delivered by the secondary, in a stepup...
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 Spring '07
 Shoberg
 Inductance

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