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Cell Flashlight
How much energy does the battery deliver in this 80 h interval?
The manufacturer of a 9V dry-cell flashlight battery says that the battery will deliver 20 mA for 80 continuous hours. During that time the voltage will drop from 9V to 6V. Assume the drop in voltage is linear with time. How much energy does the battery deliver in this 80 h interval?
If it's linear, then we can average the voltage at 7.5 volts, as long as the current drain is constant. If the current were not constant, you would have to use calculus.
7.5v x 20 ma = 150 mW
80 hours is 288000 seconds
energy = 150mW x 288000 s = 43200 joules, or 12 watt-hours
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I'm stuck on the Verizon cell phone game Escape. I have a flashlight with batteries and i'm stuck.?
Use the blacklight above the keypad to get the code.... after you combine the battery and the light.
