Cell phone batteries are rated in units of mAh, or milliampere-hours. (a) What quantity does a mAh measure? energycharge     currentpower (b) Consider a particular phone that has a battery rated at 4,000 mAh. The battery operates at a potential difference of 4.00 V.How much energy, in units of kilowatt-hours, is stored in a fully charged battery? kWh (c) If electricity costs $0.16 (or 16.0 cents) per kilowatt-hour, what is the value of the total amount of energy stored in this battery? Express your answer in cents (or 0.01 of a dollar). ¢ (d) When the phone is idle (that is, turned on but not making calls or texts, using GPS, or running any power-hungry apps), it will operate continuously for 32.2 hours from a fully charged battery, until the battery runs out. How much average current does the phone draw while idle? Express your answer in milliamperes. mA

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Chapter1: Units, Trigonometry. And Vectors
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Cell phone batteries are rated in units of mAh, or milliampere-hours.
(a) What quantity does a mAh measure?
energycharge     currentpower
(b) Consider a particular phone that has a battery rated at 4,000 mAh. The battery operates at a potential difference of 4.00 V.How much energy, in units of kilowatt-hours, is stored in a fully charged battery?
kWh
(c) If electricity costs $0.16 (or 16.0 cents) per kilowatt-hour, what is the value of the total amount of energy stored in this battery? Express your answer in cents (or 0.01 of a dollar).
¢
(d) When the phone is idle (that is, turned on but not making calls or texts, using GPS, or running any power-hungry apps), it will operate continuously for 32.2 hours from a fully charged battery, until the battery runs out. How much average current does the phone draw while idle? Express your answer in milliamperes.
mA
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