The potato-battery experiment only generates about 1.5 volts a few milliamps. For a 40W incadescant bulb you typically need 120V and about 330 mas. If you could control all your losses in circuitry and somehow group the potatoes in series you would need about 160 potatoes. Wire 80 in series and parallel that with another 80 in series. This will provide DC vice AC. You need the proper anode and cathode and proper gauge wire. 40W isn't practical application. Try smaller bulb for starters and work your way up.
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Its not the potato that determines this but the metals used in the two electrodes. As you failed to mention the metals of the two electrodes being used, I am unable to provide a specific answer.
It's completely misleading to say that a potato, or any other source of food, has a certain number of watts "in it'. The potato may contain a certain amount of chemical ENERGY; energy is expressed in JOULES, not in WATTS. The watt is a unit of power (energy / time - in this case, joules/second).
Potatoes are composed of carbohydrates which have immense molecules with varying chemical formulas and structures. Therefore, the electrons in a potato cannot be strictly calculated.
Look on the light bulb for the voltage and the power in watts. Then divide the watts by the voltage and that gives the amps. Some CFL bulbs also state the current as well as the voltage and power, which is because they can have a poor power factor.
This varies widely between manufacturers, whether it's a "clear" bulb or a "frosted" bulb, and what type bulb as in incandescent, florescent , quartz, etc etc
in a compact flourescent about 8mg.
6 yrs
There is no direct conversion for this, because these are two separate things. Watts is actual power usage. "Lumens" is how much light is provided from a specified amount of power. The typical light bulb converts some of the electricity driven through it into light, and the rest into heat. The more efficient the light bulb, the less power per lumen will be required.That is why newer bulbs can be purchased that are 13 watts and advertised as equivalent to 60 watt incandescent bulbs - the light output is roughly equivalent (lumens), but the power usage is substantially different.