Cellular (a) What quantity does a mAh measure? phone batteries are rated in units of mAh, or milliampere-hours. O energy charge O power O current (b) Consider a particular phone that has a battery rated at 4,000 mAh. The battery operates at a potential difference of 4.10 V. How much energy, in units of kilowatt-hours, is stored in a fully charged battery? 16.4 x Be careful with units. You may have expressed your answer in units of watt-hours instead of kilowatt-hours. kWh (c) If electricity costs $0.14 (or 14.0 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 29.2 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
Cellular (a) What quantity does a mAh measure? phone batteries are rated in units of mAh, or milliampere-hours. O energy charge O power O current (b) Consider a particular phone that has a battery rated at 4,000 mAh. The battery operates at a potential difference of 4.10 V. How much energy, in units of kilowatt-hours, is stored in a fully charged battery? 16.4 x Be careful with units. You may have expressed your answer in units of watt-hours instead of kilowatt-hours. kWh (c) If electricity costs $0.14 (or 14.0 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 29.2 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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Transcribed Image Text:Cellular phone batteries are rated in units of mAh, or milliampere-hours.
(a) What quantity does a mAh measure?
energy
charge
power
current
(b) Consider a particular phone that has a battery rated at 4,000 mAh. The battery operates at a potential difference of 4.10 V. How much energy, in units of kilowatt-hours, is stored in a fully
charged battery?
16.4
X
Be careful with units. You may have expressed your answer in units of watt-hours instead of kilowatt-hours. kWh
(c) If electricity costs $0.14 (or 14.0 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 29.2 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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