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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?
Wiki User
∙ 14y ago
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.
Wiki User
∙ 14y ago
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What causes voltage on 1999 Saturn sl2 to go from 12.2V to 14V at random times?
The cause is the voltage regulator within the alternator (working normal). When the voltage higher it is charging the battery like after you start your car or have the headlights and wipers on. The voltage regulator keeps your battery charged up. In order to charge the battery, voltage must be higher than battery voltage.
What type of circuit in which voltage is constant?
A mercury battery will provide constant voltage. A voltage regulator circuit will also.
How many volts does a 7.2 volt charger put out?
Without knowing the maximum output current it was designed to produce it isn't possible to say exactly how much voltage a charger produces. Also, was it intended to give a slow or a fast charge? In general all that can be said is that the output voltage of a battery charger must always be slightly higher than the nominal voltage of the battery it was designed to charge. This is for the simple reason that it won't be able to put any charge into the battery unless the charger's "on-load" voltage is higher than the battery's voltage. For the same reason, a charger which can deliver a high output current (amps) will need a higher "on-load" output voltage than a charger which can only deliver a low current. Also, when it is switched on but is not connected to a battery, the output voltage of any charger will always be higher than when it is doing its job of charging a battery. That voltage is called the "no-load" voltage. Assuming the battery being charged is a standard low-voltage type, of less than, say, 24 volts DC, it is quite safe, using a standard electrician's voltmeter, to measure the load and no-load voltages of the charger as described above.
What is internal resistance of battery?
The equivalent resistance you would have to place in series with an ideal battery (which of course does not exist) of the same voltage to get the same behavior (voltage drop with load) as the real battery has. It is a mathematical modeling technique to help in circuit analysis.
Can use 14.4 volt charger to charge 18 volt battery?
Charger Output Voltage versus Battery VoltageNO, the output voltage of a charger must be greater than the rated voltage of the battery, usually at least one and a half to two volts difference.
Is it possible to find out how much voltage is stored in a solar cell?
A solar cell does not store electricity. It charges a battery that stores electricity. The voltage of a battery can be found by connecting a voltmeter to the battery terminals.
A battery produces voltage using?
battery produces voltage by
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 damage can result from connecting the battery cables to the wrong terminal battery post?
The battery will be Damaged. Possible damage to the Started Relay. Also check the alternator, more specifically the voltage regulator circuit which is built into the alternator. The battery will be Damaged. Possible damage to the Started Relay. Also check the alternator, more specifically the voltage regulator circuit which is built into the alternator.
What would cause the 'battery' light to stay on?
Some possible clues: * Alternator/Generator not putting out enough voltage to properly charge system * Voltage regulator problems * Weak battery, or one that's about to give out totally
What is the voltage between point p and the battery?
The voltage between point p and the battery is not able to measured exactly. You can never measure the absolute electric potential at any point. its just not possible. That is why we talk about difference in potential.
Does higher voltage mean longer battery life?
Yes The larger the battery, the more voltage the battery has.
What can cause the battery light to come on in a 2000 Expedition but the voltage gauge reads fine?
Possible bad alternator.
Battery light stays on in your Chevy silverado 2005?
test the voltage on the battery first, then on the alternator. If its good then it could just be the diode in the alternator. I would suggest you replace it becuase eventually your alternator will die and the battery will not get charged leaving you stranded somewhere. It is possible to just be a battery but you wont know unless you have the battery tested. check the voltage on the battery and the alternator before you do anything else.
What is a question for a lemon?
One possible question is "How does the voltage of the battery change if different combinations of metals are tried for the two electrodes?".
Can an alternator charge a battery with only a 12.5 volt?
13.1v is about the lowest possible charging voltage.. 14.0 to 14.8 is better.
Can lead acid battery work as alkaline battery?
Perhaps it would be possible to replace an alkaline battery with a lead acid battery of the same voltage and current capacity. BUT the construction, size, and chemistry of the two types are totally different.
