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How many batteries would it take to light a 12 volt 100 watt light bulb?
Wiki User
∙ 12y ago
12 volt batteries vary in size. You need to look at the amp hours of a battery and multiply by the voltage. So, a 100 amp hour battery at 12 volts is 1200 watt hours. 30 watt bulb will eat that up at 30 watts and hour. 1200 divided by 30 is 40 hours. Simple huh!?
*Something to keep in mind is if your 30 Watt light bulb is rated 30 watts at 12 volts. If it is rated 30 watts at 24 volts, 110 volts or another voltage it will also change the length of time your battery will last.
Wiki User
∙ 14y ago
Wiki User
∙ 11y agomultiply the A.H. (amp hours) of your battery times 12 volts. = watts.
Ex. 100 AH battery times 12 volts equals 1200 watts.
Now divide 1200 watts by 35 which gives you 34.38 hours, the length of time it will last.
Wiki User
∙ 15y agoThis depends on the amperage of the battery. Wattage (400) = Voltage (24) x Amperage (???). Once you can determine the amperage per hour you can determine how long the battery will last.
Wiki User
∙ 12y agoThat depends on the voltage of the batteries. A single car battery has 12 volts, so it is enough. Dry cells usually provide 1.5 volts, so you would need 8 of those to get 12 volts.
Wiki User
∙ 11y agoThe formula you are looking for is I = W/E. Amps = Watts/Volts.
Wiki User
∙ 10y agoTo answer this question the amp hour capacity of the battery would have to be stated.
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