0
What resistance is required to run a 6V 75A light with a 12V 2.5A battery?
Wiki User
∙ 15y ago
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.
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
If a 12v car battery has 0.04ohm internal resistance what is the battery terminal voltage when the battery delivers 40A?
011.1
How much resistance required to convert 12V DC to 10.5V DC?
How much current? Volts/Amps = Ohms. In your case Volts = 1.5
Can I use a 12v 18 amp battery and connect to a circuit that asks for 12v Static current 6mA Can I use resistors to lower the amps on the 12v 18amp battery or can I just connect it up?
Just connect the circuit. It will only draw the amps it needs to operate. It is just like connecting a 100 watt light bulb that draws way less than 1 amp, to a 20 amp household circuit.
What will be the amps of a 12v 2amp circuit if there is a 12ohm resistor on it?
The formula you are looking for is I = E/R. Amps = Volts/Resistance. If you say it is normally a 2 Amp circuit, it normally draws 2 amps. Therefore the original resistance offered to the 12v battery is 2/12 = 6 Ohms. If you then connect a 12 Ohm resistor in series, they are added, so R = 18 Ohms. Now if you put 12v across this circuit it will draw 12/18 = 0.66 Amps. Or If you just put a 12 Ohm resistor across the 12v supply it will draw 1 Amp. If the circuit is protected by a 2 Amp fuse, it will not blow, but the resistor will get hot.
What should be charging current for 12V 3Ah battery?
There is not enough information. It depends on the type of battery: chemistry, cells, size.
If a 12v car battery has 0.04ohm internal resistance what is the battery terminal voltage when the battery delivers 40A?
011.1
Will a 12v lithium battery rated at 1000ma run a 12v 100w light bulb?
no
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 power one or more automotive light bulbs with a 12V Alkaline lantern battery?
Yes you can but it will drain that battery quickly.
When a 12 V battery is connected across an unknown resister there is a current of 2.5 mA in the circuit find the value of the resistance of the resistor?
Resistance = voltage / current = 12V / 2.5mA = 12V / (2.5 x 10-3 A) = 4.8 x 103 ohm
Can you recharge a 3V battery with 12V charger?
No, you can not charge a 3V battery with 12V charger.
Can you charge a 7.2V battery with a 12V power supply?
Yes, you can, but you need to put a resistance in series with the battery to limit the maximum current, so you don't overheat and cook the battery. I tend to fast charge my batteries using a 12v light bulb / utility light to lower the current. The bulb will glow when the battery is taking heavy current, and as the battery builds up charge, the current will drop and the bulb will get dimmer and dimmer. I try to limit the current to 1/10 of the capacity of the battery Im charging if I can. Otherwise, I monitor it with an ammeter and voltmeter and watch the lightbulb. $.02 Ed N3SDO
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.
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.
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.
What can a 12v battery power?
Anything needing 12V to operate.
