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They don't. Car batteries produce 100's of amps of current. a 1.5Volt flash light battery produces milli-amps at best.
12/1.5= 8. If I = Current from 1.5 Volt source and I2 = current from 12 V source then I = I2/8 or said in another way the current from 1.5V device is 1/8 of the current from 12 V device.
No real comparison. In simplistic terms the D cell 1.5 volt flashlight battery will produce around 15 ampere hours. A 12 volt automobile battery will produce from 300 cold cranking amps (CCA) to 800 CCA or more.
They are for different purposes. You cannot compare apples to oranges.
Do you mean the maximum possible current, or the current in normal applications? Car batteries have low internal resistance since auto starter motors draw a lot of current, a CCA (cold cranking amperage) rating of around 600A is not unusual for a car battery some can be even higher.A flashlight cell is not designed for that sort of current, while the maximum will depend on cell size and chemistry, I suspect a couple of amps might be a good guess at a maximum. However, the rechargeable NiCad or NiMH cells used in portable power tools can probably put out significantly more for short periods.Driving the same load resistance the current from a 12V battery will be 8 times that from a 1.5V battery. Assuming the load is not overloading the battery (and it might overload the flashlight cell if the resistance is too small).This is simple arithmetic: 12÷1.5=8
Current will go up by a factor of 6 times in that scenario.
Current will go up by a factor of 6 times in that scenario.
3v battery is used direct current
V = IR, so if you double the voltage without changing the resistance, the current will also double.
you will have to get 2 batteries and compare it
None.
If a 9.0 volt battery is connected to a 4.0-ohm and 5.0-ohm resistor connected in series, the current in the circuit is 1.0 amperes. If a 9.0 volt battery is connected to a 4.0-ohm and 5.0-ohm resistor connected in parallel, the current in the circuit is 0.5 amperes.