Put a new alternator on it or tear the old alternator apart and replace the voltage regulator in it.
Alternator going out.
In short circuit test very low voltage at primary approx 5 % of the rated voltage is given and secondary is short circuited by an ammeter. Due to low voltage very low flux is developed in core of the transformer and due to that iron losses are very low which can be neglected. By Rizwan: actually it is operated at (10-15)% of the rated voltage and as you know n case of low voltage low magnetic flux is produced and then there will be low magnetic field density(B). and we know hysteresis and eddy current losses depend on (B).as in case of : hysteresis depends on B^1.2 and eddy current depends on B^2 So if B is low then both losses(collectively called constant losses) will be very very low.
Yes.
Because the alternator will keep your car running as long as its running Type your answer here...
Because a short-circuit test is done at very low voltage to check the transformer windings on their maximum current. The low voltage ensures that the magnetic flux in the transformer's iron core is very low so that the eddy-current losses, usually known as iron losses, are negligible.
A medium voltage switch gear is on the low voltage side of the transformer. This medium voltage switch is very cost efficient as well.
i think that if the voltage was very low it will give less power to the bulb
Yes. The potential energy in this case is the product of the voltage and the charge.
Sounds like the car is running off of battery power and the battery is very low on charge. The charging system has failed.
Low voltage light usually comes on because alternator output is low or none. Put a volt meter across battery terminals, with car off, voltage should be around 12.5 or so, now start car it should jump to 13.8-14+ volts. If voltage doesnt jump then the alternator or votlage regulator are likely bad.
Yes, if the voltage level is too low to start the car.
It's all relative. A battery has internal resistance. Batteries are not "ideal" voltage sources. If there is a "heavy" load on the battery (low resistance), the voltage you measure on the outside of the battery will be lower. A car battery is normally thought of as a 12 volt battery. When there is no load (disconnected) you can often measure in excess of 13 volts if it's fully charged. During normal cranking of the engine, the voltage can drop below 11 volts.