You are out of gas in the desert and you accidently dropped your phone battery down an Abandoned oil well. You have a charged ca
r battery (12 volts) and a bunch of resistors and wire. You want to power your cell phone with this battery but the cell phone only operates if it has 3.6 Volts across its power terminals. (3.7 Volts will destroy the phone and 3.5 will fail to operate the phone.) If the cell phone uses 0.15 Amperes in all modes, design a circuit that will operate your cell phone from this car battery and let you call for help.
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