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Why can't you use a multitester as an ohmmeter if it has no battery?

The battery is used by the meter to apply a voltage across the resistance being measured and determine the current which determines the resistance. If there is no battery it can't supply the voltage and can't measure current, so no reading.


What does Wh and mAH mean on a battery?

The battery can supply an amount of electric charge measured in milliampere-hours, which expresses its capacity to supply a load of a number of milliamps for a number of hours. The idea is that if the load current is high, the battery lasts for less time, so the current times the time makes good measure of the capacity. It is also common practice to measure larger batteries in amp-hours, and there are 1000 mAH in one AH. This measure is a nominal one because in practice a high current load will give a lower AH capacity than when the load is small. Multiplying the voltage by the AH capacity gives the watt-hour capacity, which measures how much energy the battery can supply. This measures is also only a nominal only because as the battery runs down its voltage reduces.


What is the charging time on a 9.6 volt battery?

No, not unless it has a voltage or current regulator or series resistance to limit the current (built in somewhere).


A 19 V battery delivers 114 mA of current when connected to a 72 resistor. Determine the internal resistance of the battery.?

Internal resistance is approximately equal to 94.667


Which 12 volt bulb will draw the most current when connected to a 12 volt battery?

The bulb with the lowest resistance. Current = Volts / Resistance

Related Questions

Can you use 300mA adapter for a 1050mA camera battery?

It depends on how its connected and how much current the camera needs to run on. The "1050ma" figure is the capacity of the battery not how much current the camera uses and it should read 1050mah which is a capacity measurement not a current measurement.


What is the effect of high temperature of current carrying capacity of battery?

The higher the temperature of a battery, the faster the chemical reactions in the battery, and the shorter the battery life span.


How many mAh does a 9.6v have?

To calculate the mAh capacity, we need to know the current rating of the battery as well. The mAh (milliampere-hour) capacity is a measure of how much charge a battery can hold over time. It is not determined solely by the voltage (9.6V in this case) but also by the current rating of the battery.


What does 8Ahmean on a 12 volt battery?

Amp hours is a battery rating. It means that this battery can sustain 1 amp for 8 hours up to 8 amps for 1 hour. Depending on what the current draw is on the load will determine the length of time the battery will last.


How do you calculate battery Capacity?

A battery's capacity is measured in Amp Hours. This is how many Amps of current a battery can provide in a given number of hours. A battery can produce a lot of current for a short time, or a little current for a long time. A curious property of chemical batteries is they are able to provide a higher total energy capacity if they are discharged at lower rates. For example, a particular battery may be able to provide 10 amps of current for 1 hour for a battery capacity of 10 Ahr. The same battery may be able to be discharged at 5 amps for a 2.5 hour discharge period for a capacity of 12.5 Ahr. And at a discharge rate of 1 amp the exact same battery may may last 15 hours for a capacity measurement of 15 Ahr. For that reason typically battery capacity is specified over a standard period of 10 or 20 hours time. When comparing batteries, make sure that the test period for the battery rating is the same. A battery with 100 Ahr over a 20 hour test period is not the same as a battery with 100 Ahr over a 10 hour test period.


Does batteries connected in parallel increase the current capacity to the circuit?

If each battery is identical, yes.


How long will a 12 volt battery provide 100 watts?

To calculate the duration a 12 volt battery will provide 100 watts of power, you can use the formula P = V x I, where P is the power (100 watts), V is the voltage (12 volts), and I is the current. Rearranging the formula to solve for current, we get I = P / V. Plugging in the values gives I = 100 watts / 12 volts = 8.33 amps. The battery's capacity, typically measured in ampere-hours (Ah), can then be used to determine how long the battery will last. If the battery capacity is say 50Ah, you can divide the capacity by the current to find how long the battery will last: 50Ah / 8.33A = approximately 6 hours.


How many ampere in a 12V battery?

The amperage of a 12V battery depends on its capacity, which is measured in ampere-hours (Ah). To calculate the amperage, you would divide the capacity (Ah) by the voltage (V). For example, a 12V battery with a capacity of 100Ah would have an amperage of 8.33A (100Ah / 12V).


How many hours will 3600 watts last on a 637 amp battery?

To determine the hours a 3600-watt load will last on a 637 amp battery, you need to convert the wattage to amperes. You can do this by dividing the wattage by the voltage of the battery. Assuming a standard 12-volt battery, 3600 watts divided by 12 volts equals a current of 300 amps. Dividing the battery capacity (637 amp-hours) by the current (300 amps) gives you approximately 2.12 hours of runtime.


What is maximum current of 9 volt dc battry?

The maximum current capacity of a 9-volt DC battery will depend on the specific type and size of the battery. However, for a typical alkaline 9-volt battery, the maximum current output can range from around 500mA to 1000mA. It is important to check the specifications provided by the manufacturer for the exact current rating of the specific battery model.


What design characteristics determined the current capacity of a battery?

The surface area of the plates. This area is increased dramatically in car batteries by making a fine paste of Lead/Antimony and pressing it into a lead matrix plate. This presents a huge area to the sulphuric acid and increases it's storage capacity and ampere/hour delivery.


If you have a circuit consisting of a battery and a wire What two factors determine the amount of current in the circuit?

The voltage of the battery, and the resistance of the circuit (including the resistance of the wire and the internal resistance of the battery).