19_InstSolManual_PDF_Part20 - 19-20 Chapter 19 19.78 Set Up...

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19.78. Set Up: The power dissipated in a resistor is The power for an emf is When the current passes through an emf from the to the terminal, chemical energy is converted to electrical energy. When the current passes through the emf from the to the terminal, electrical energy is converted to chemical energy. Solve: (a) Assume the current in the circuit is counterclockwise. The loop rule gives: (b) (c) In chemical energy is being converted to electrical energy, at the rate 19.79. Set Up: Electrical energy is deposited in his body at the rate Heat energy Q produces a temperature change according to where Solve: (a) The energy deposited is Find when (b) An increase of only 63 brings the water in the body to the boiling point; part of the person’s body will be vaporized. Reflect: Even this approximate calculation shows that being hit by lightning is very dangerous. 19.80. Set Up: Solve: (a) The tube of seawater has resistance (b) The object and the remaining tube of seawater are in series. The 10 cm tube of seawater has resistance 130 .
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