What are b,c,and d? Problem 18.88 Part A Battery-powered electricity is very exp

Question

What are b,c,and d?

Problem 18.88 Part A Battery-powered electricity is very expensive compared with that available from a wall receptacle Estimate the cost per kWh of an alkaline D-cell (cost $1.70).This battery can provide a continuous current of 22 mA for 770 h at 1.4V Express your answer using two significant figures. 8/kWh My Answers Cost/kWh = 72 Submit Give Up Correct Part B Estimate the cost per kWh of an alkaline AA-cell (cost $1.25). This battery can provide a continuous current of 22 mA for 100 h at 1.4 V Express your answer using two significant figures. Cost/kWh S/kWh Submit My Answers Give Up Incorrect; Try Again; 13 attempts remaining Part C Compare to normal 120-V ac house current at $0.10/kWh Express your answer using two significant figures. Cost n-cell

Explanation / Answer

(b) The power is
  
P = I * V

= 22*10^-3 * 1.4

= 0.0308 W

The energy is E = 0.0308 * 100

= 3.08 W.h

= 3.08*10^-3 KW.h

The cost is = $ 1.25/3.08*10^-3

= 405.84 $/KW.h

(c) For part a 728 times more expensive than the wall.

For part b 4058 times more expensive than the wall.

(d) The ratio of cost AA cell to cost ac house current is

= $ 405.84/$ 0.10

= 4058

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