Best Answer

You can't run a 6V 75A (450W) light off a 12V 2.5A (30W) battery for any significant length of time. That battery is grossly undersized. I think that's supposed to be "0.75A" instead of "75A." I found a 75-watt light bulb on the internet, but 75 amps? You could weld with that much power. And I like the answer right below this one best: just wire two of these bulbs in series. The answer is simple by using the formular called OHM's LAW (V=IxR) The 6V,3/4 amp bulb has (approx) 8 ohms resistance which 'drops' the 6 volts across it. At the same current (thru the SERIES circuit) you need anothe 8 ohm resistance. Unfortunately, the bulb dissipates 4.5 WATTS of power, the same as your 'extra' resistor will have to handle. (Rather WARM!) The easiest trick to do would be to put two 6v bulbs together in series, this will put your 'extra' resistor (the second bulb's filament) inside of a protected glass shell. The second bulb will not waste any more power than the resistor, and will give you twice the light.

User Avatar

Wiki User

โˆ™ 2009-01-02 01:52:01
This answer is:
User Avatar
Study guides
See all Study Guides
Create a Study Guide

Add your answer:

Earn +20 pts
Q: What resistance is required to run a 6V 75A light with a 12V 2.5A battery?
Write your answer...
Related questions

If a 12v car battery has 0.04ohm internal resistance what is the battery terminal voltage when the battery delivers 40A?


Will a 12v lithium battery rated at 1000ma run a 12v 100w light bulb?


Can you charge a 12v lawnmower battery with a 12v car battery?

can a 12v lawn mower sealed battery be charged with 12v battery charger use on cars

Is the 55b24l s battery a 12V or 6V?

The battery is a 12V car battery.

Can you charge a 12v battery with a 18v charger?

I'm actually charging my 12V sealed lead acid battery with a laptop adapter which output is 19V, 2.1A. I'm not sure this will shorted the life of my battery or not, but the battery hold the charge. I don't have a voltmeter to test the voltage, but the battery can light up a 12V car headlight light bull. So, I guess it work.

Can you use a 12V 4ah battery to replace a 12V 7ah battery?

Yes, you can.

Can you use a 12v 12ah battery instead of a 12v 8ah battery?

ofcourse. You can use 12V,12ah battery instead of 12V ,8ah. But you cant use 12V ,8ah instead of 12V,12ah battery . since the 12ah can drive more load than 8ah. but 8ah cant drive as 12ah

Can you power one or more automotive light bulbs with a 12V Alkaline lantern battery?

Yes you can but it will drain that battery quickly.

Can you recharge a 3V battery with 12V charger?

No, you can not charge a 3V battery with 12V charger.

Can you replace a 12v 18ah battery with a 12v 22ah battery?

Yes you can. No issues at all.

When you charge your motorcycle battery should it be on 6 or 12 volt?

Depends if its a 6V or 12V battery. If its a 12V battery, us the charger in the 12V setting.

Can I connect 12 volts headlight to my 60 volts electric bike?

If the bike uses 5 12V DC batteries connected in series to achieve 60V DC you can connect the positive and negative wires from the 12V light ONLY to the first 12V battery in that series. The bike will remain 60V and the lights will be powered by the first 12V battery. If you connect the 12V light directly to 60V the light will blow instantly. Test the voltage with a volt meter before making any connections.

Can you plug in pest control into a 12V battery?

In order to use the "plug in" pest control with a 12V battery, the device would have to have power requirements less than or equal to that which a 12V battery can provide. The pest control would also need an adapter to use the 12V battery.

Is a 23A battery the same as a A23 battery?

Yes. I had a 23A, 12V, battery for my ceiling fan and replaced it with an A23, 12V, battery, and it worked just fine.

What is the battery light on for on your Chevy Astro?

The battery light comes on when the charging system voltage drops below 12V. If your light is on all the time, have your charging system checked because it probably is not charging the sytem.

Will gerbing's 12v hybrid battery work with the 12v corded heated glove liner?

Yes, their 12v mobile battery pack will work with all of their 12v gloves that are otherwise designed to be connected to the motorcycle's battery. The only downside to connecting the glove liners to the mobile 12v battery is that there is no place to store the battery on the glove itself, while all of the Core7 and the Hybrid gloves all have battery pouches in the cuffs.

What can a 12v battery power?

Anything needing 12V to operate.

How can a test light be used to test for power and ground.?

Testing for 12V DC power using a 12V DC test light, clip the test lead to a known ground (preferably battery negative post) then probe with the test light tip for power. Test light will illuminate when power is touched.Testing for 12V DC ground, clip the test lead to the positive post on the battery then probe with the test light for grounds. Test light will illuminate when a ground is touched.

A 10 ohms resistor is connected aross a 12 volt battery How much current is there through the resistor?

Voltage = Current * ResistanceVoltage = 12VResistance = 10 ohmsCurrent = Voltage/ResistanceCurrent = 12V/10 ohmsCurrent = 1.2 Amps

Is a 12v car battery the same as a 12v lantern battery?

Voltage is the same but amp hour capacity of the car battery is much higher.

Can a 12V 10Ah battery be used in a motorcycle that's supposed to use a 12V 9Ah battery?

Yes, if it will fit.

Can you use a 12v 7.2 ah battery to replace a 12v 4 ah battery in an alarm system?


What power tools will the Makita 12v battery work with?

The Makita 12V battery will work with many different power tools such as the power drill for LCT208W. The Makita 12V battery is primarily for power drill tools.

Are there any online stores where I can buy a 12v rechargeable battery?

Yes, there are may online stores that your can buy a 12v rechargeable battery at such as along with other stores.

Is a Honda 300cc 3 wheeler battery 6v or 12v?