What battery powered appliance uses the most power?

I’m doing a science fair project on what battery has the most amount of power. My experiment is to leave a battery powered appliance on until the battery runs out of energy. Then, the time will be recorded and compared. I want to spend the least amount of time possible with the experiment, using an appliance that uses a ton of power.

Any suggestions? Best Answer goes to first good answer.


5 Responses to “What battery powered appliance uses the most power?”

  1. Scott  on March 30th, 2011

    How about my crap iPod? Barely lasts an hour.


  2. billrussell42  on March 30th, 2011

    An electric automobile.

    Other than that, the only ones are small ones, and of those, a laptop PC, which uses 30-50 watts, is probably the most.

    The problem with most battery operated things, is that the power usage changes depending on what you do with them. A laptop, for example, uses more power during a disk access, for example, and when not used for a few minutes, goes to sleep, which cuts power down a lot.

    My camera, if not used for a minute, shuts itself off.

    But I don’t see how you can gain any info from these. The battery life is determined by design, you can’t change batteries to a dfiferent type.



  3. bad guy wanna get good  on March 30th, 2011

    A UPS ( Un interrupted power supply).. when power fails , then UPS lights your whole hose using a 12 Volts 200A battery.. and it barely lasts for about 1.5 hours.


  4. MarkG  on March 30th, 2011

    A simple flashlight which uses an incandescent light bulb is a big drain an it is commonly available in most homes. Next would be a battery operated motor such as a hand held portable fan.

    But lets not forget Ohms law (E= I * R) and how you can use a simple resistor to drain the battery at a known and consistent rate (compared to a radio that varies in volume from song to song for example).

    You can buy a couple of 10 Watt resistors at radio shack



    You can use two 10Ohm 10Watt resistors wired in parallel for 5 ohms, wired in series for 20 ohms or individually for 10 ohms and connect these to a single 1.5V cell to drain it.

    Power is voltage * current (P= I * E) or current squared time resistance.

    1.5V / 5 = 0.3 A or 300mA

    0.3 * 0.3 * 5 = 0.45 Watts This is well below the 10W rating and will easily handle the power dissipation .


    Using a resistor on a single cell will also simplify your testing and lower your testing costs because you will only need to drain one battery (cell) at a time. Plus you can buy a battery holders for different sized batteries which will hold one cell.


    >>>>> L@@K < <<<<

    Have you considered using a data logger to let a computer monitor and record voltage readings for you? You can get a cheap one for $29 and if you use it in a science fair it can be FREE.

    See these links for detail on how to get a free Data Logger

    Application Form:

    Data Logger:


  5. phil boola  on March 30th, 2011

    a bored chicks vibrator


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