Berkeley CSUA MOTD:Entry 38746
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2018/07/19 [General] UID:1000 Activity:popular
 7/19

 2005/7/21-22 [Science/Electric] UID:38746 Activity:moderate ```7/20 I have a 12V fan that takes 10W. If I power it using a 2000mA battery, how long does it take? Basically I don't have a good clue on the relationship between wattage, amp, and voltage. Thanks! \_ V = IR and P = VI. Didn't you take physics? \_ You probably have a 2000mAh battery. That's 2000 milli-amp hours. Given that, you should be able to figure out how long the battery ought to last. \_ 144 minutes. -nop \_ It's impossible to answer this question without knowing the voltage of the battery. \_ Assuming that it's a 12V battery. \_ Really? I get 25: http://csua.org/u/csl --dbushong \_ Dave, your answer seems to have the units of 25/minute. Check your units. I agree with nop.--PM \_ Pfft. Units. --dbushong \_ 144 minutes ... P = VI, 10W = 12V * I, I = .8333 amps. 2 Amp-hours @ .8333 amps will therefore take 2.4 hours to run out making 144 minutes.```
2018/07/19 [General] UID:1000 Activity:popular
 7/19

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