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What is the lowest voltage for car battery and still be good?
The lowest voltage a battery can drop to during cranking while still starting the car is 9.6v. You can tell a battery's state of charge by the voltage (12.6v is fully charged, 12.0v is low), but the way to tell if a battery is bad is to look at how the voltage changes under load. Most battery testers put a load of half the cold cranking amperage indicated on the battery and look for the voltage to drop below 9.6v, in which case the battery is determined to be bad. Another way to do it at home is to charge the battery at high amperage (can be done by revving the engine slightly and turning off electronics) and, using a voltmeter, look for the voltage to be above 15.5v. This indicates a lower amperage charge than desired and also that the battery should be replaced.
Do headlamps in your 2000 blazer get dim after 6 years?
The head lamps should not get dim. Dim light are an indication of low voltage. You should have a volt meter in the instrument panel. If the voltages is not reading about 14V when the engine is running, you have a bad battery or alternator. It should read over 12V with the engine not running and the ignition in the on position. It should not drop below about 9-10 when cranking the engine. If you have low voltage during cranking and normal voltage at other times, you probably need to replace the battery.
Can a corroded battery cause a voltage drop?
Yes, a corroded battery can cause an intermittent voltage drop.
How can we check the starter's external wiring circuit for volt drop?
For voltage drop checking on the wire from the battery positive post to the starter main terminal, you place the voltmeter reading on the 1 to 3 volt range, (or what lower range you have). You then place one voltmeter lead on the positive battery post, the other lead you place on the starter positive terminal and have someone crank the engine. While the engine is cranking, you observe the voltage drop. It should be less than a volt. This seems strange because you would think the cable would not drop voltage but it sure can. If the battery post is dirty or bad connection, you could see a voltage drop all the way to the maximum 12 volts battery voltage depending upon the connection. Also you can check the return path the same way--- Negative case of the starter to the negative post on the battery for voltage drop. If it is more than a volt or two, you have a bad ground return circuit.
How is it possible to have a high current with a low voltage such as in a car battery if current equals Voltage divided by Reistance then shouldn't a low voltage produce a low current?
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.
What voltage should a 6 volt battery be?
A 6-volt battery should ideally measure around 6 volts when fully charged. When the battery is under load or partially charged, the voltage may drop slightly but should generally remain above 5.5 volts. If the voltage falls significantly below this level, it may indicate that the battery is discharged or faulty. Regularly checking the voltage can help ensure the battery is functioning properly.
What would be the voltage drop across two 25 resistors in parallel if the source voltage were equal to 9v?
The voltage would 9V minus any drop in the battery.
What causes a voltage drop on a 12 volt battery?
A voltage drop on a 12-volt battery can be caused by several factors, including high current draw from connected devices, internal resistance within the battery, or poor connections in the wiring. As the load increases, the battery struggles to maintain its voltage due to these resistive losses. Additionally, aging or sulfation of the battery plates can further increase internal resistance, leading to a more significant voltage drop. Regular maintenance and monitoring of battery health can help mitigate these issues.
How does internal resistance affect operation of a cell or battery?
It causes the battery's voltage to drop when a current is drawn from it.
What is the distance you can have between a 65amp hour battery and its charging unit?
you need to have a small enough voltage drop to still charge the battery with above 12 V input from your alternator. The voltage drop depends on wire size and distance, with bigger wires you will have less voltage drop which is due to the wire resistance.
Why is there a voltage drop across the terminals of a chemical battery that is worn out?
Hi, The voltage may not drop all that much since a battery's output is a specific current at that rated voltage. It possible to place a digital multimeter on a 1.5 volt battery and see 1.5 volts. However, the battery could be as dead as a doornail. Hope this helps, Cubby
What is cranking amphere?
Cranking amperes (CA) refer to the amount of current a battery can deliver at a specific temperature (usually 0°C or 32°F) for a short duration, typically 30 seconds, while maintaining a minimum voltage level. This measurement is crucial for determining a battery's ability to start an engine, particularly in cold weather conditions. Higher cranking amperes indicate a battery's greater capacity to provide the necessary power to turn over an engine. It's an essential specification for automotive batteries, especially in environments where temperatures can drop significantly.
