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A cell phone battery has 9.00 X 10^-3 kWh of energy stored in it

angie19

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7 years ago

A cell phone battery has 9.00 X 10^-3 kWh of energy stored in it

#1) A cell phone battery has 9.00 X 10^-3 kWh of energy stored in it. If the battery runs at 3.20 V and draws an average of 0.375 A of current, how long will the battery last?
Show you work, include- Formula, and substitutions and express your answer rounded correctly and with appropriate units.

#2) A power station produces 500 megawatts of power. The energy produced by this station in 24 hour period is a.b X 10^cd J.

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bio_man

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habiba

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Staff Member

7 years ago

E = 9.00 watt*h
P = V*I = 3.2*0.375 = 1.200 watt
time t = E/P = 9.00/1.2 = 7.50 hours

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habiba

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Staff Member

7 years ago

Quote from: angie19 (7 years ago)

#2) A power station produces 500 megawatts of power. The energy produced by this station in 24 hour period is a.b X 10^cd J.

Power (in Watts) = Energy/time, (in Joules/sec).
You are given that the Power is 500 * 10^9 watts, right?
You are given that the time interval is 24h. How many seconds is that?
So, just solve for the Energy now.

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angie19 Author

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7 years ago

so its (500 * 10^9) *( 24 hr)
= 1.2*10^14

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habiba

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7 years ago

yea

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angie19 Author

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7 years ago

yessss thank you!

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Taylor T.

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3 years ago

love it

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