problem dealing with power and batteries.?

Question

A typical 3.5 V alkaline D battery is rated at 2.3 amp-hours. What is the power that can be expanded by the battery in watts?

i mean what the problem says. The answer is 8.05. How i get it? 3.5v*2.3A

Answer 1

2 things - an alkaline D is about 1.5 V, and I think you mean "..the battery in watt-hours", right? If so, the watt-hour capacity of the battery would be 1.5V * 2.3A-hr = 3.45W-hr.

Watts is a rate of power, and electrical power in watts is volts*amps - in this particular battery, you could draw 3.45W for 1 hour, or 6.90W for 0.5 hours, or 1.725W for 2 hours, etc, etc. So there is no definite answer in watts.

But watt-hours is a measure of energy, and is equal to volts * amp-hours, and in this case, the total energy in the battery is 3.45W-hr

Answer 2

I think you mean 1.5 V alkaline battery.

Power = Volts * Amps.

Power = 1.5 * 3 = 4.5 Watts (for about 1 hour)

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