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angie19 angie19
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8 years ago
#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_manbio_man
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#1
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8 years ago
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#2
Staff Member
8 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
Ask another question, I may be able to help!
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#3
Staff Member
8 years ago
Quote from: angie19 (8 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.
Ask another question, I may be able to help!
angie19 Author
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#4
8 years ago
so its (500 * 10^9) *( 24 hr)
= 1.2*10^14
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#5
Staff Member
8 years ago
yea
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angie19 Author
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#6
8 years ago
yessss thank you!
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#7
5 years ago
love it
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