You don't see the trees through the forest!

Like I said model it.

Dave




"Gymmy Bob" wrote in message ...
| Yeah OK, I will state the blatantly obvious. The sum of the currents
| entering the point is equal to the sum of the currents leaving the point.
|
| So watt?
|
| Who cares if the resistance of the battery is greater or lesser than the
| R(load)? The current is inversely proportional to the total circuit
| resistance. This includes the battery and the load.
| Ohm's law
| part 1
|
|
| "David H. Lipman" wrote in message
| ...
| Nope....
|
| This is NOT an electronics News Group so I will not go into an explanation
| why Ohm's Law is
| insufficient and Kirchoff's Law is apropos.
|
| I will say model the circuit. Where...
| - R(load) is less than R(internal resistance of battery)
| - R(load) equals R(internal resistance of battery)
| - R(load) is greater than R(internal resistance of battery)
|
| Dave
|
|
|
| "Gymmy Bob" wrote in message
| ...
| | "Kirchoff" has nothing to do with this one except the blatantly obvious.
| | Ohm's law is the one you want there son.
| |
| | "David H. Lipman" wrote in message
| | ...
| | The *BEST* statement and conforms to Kirchoff's Laws.
| |
| | Dave
| |
| |
| |
| |
| | "William Graham" wrote in message
| | news:Tv%Dc.123150$eu.69086@attbi_s02...
| | |
| | | "Robert Mathews" wrote in message All
| batteries
| | have
| | | internal resistance and goes up as the battery ages..
| | |
| | | This is true, but the internal resistance of the battery is only a
| very
| | | small percentage of the resistance of the load, with the exception
| of a
| | car
| | | battery during the "start" operation, where the battery is very
| heavily
| | | loaded. This is why a car battery's output drops to nearly 8 volts
| while
| | the
| | | starter is turning over the engine. Normally, the load puts so
| little
| | load
| | | on the battery that the voltage difference is unmeasureable.
| | | There is one thing that I forgot to mention, however. Sometimes
| the
| | | manufacturer specifies a certain type battery because of charging
| | | considerations. Naturally, if the batteries can be charged while
| inside
| | the
| | | camera or other device, and the manufacturer supplies the charger,
| then
| | only
| | | the specific battery that the manufacturer recommends should be
| used. -
| | | Worst case sceneareo would be if one tried to use non-rechargeable
| | batteries
| | | such as alkelines, and the charger would overheat and explode them
| while
| | | they wre inside the device, damaging that device. - In this case, I
| | agree
| | | completely. - Only use the manufacturers recommended battery.
| | |
| | | A 12 volt light bulb will operate the same with a lead-acid truck
| | battery
| | | that is capable of delivering 200 amperes, and not burn out one
| | second
| | | sooner that it would if operating on eight 1-1/2 volt AA
| flashlight
| | | batteries. Now, having said that, it is certainly true that there
| are
| | | types
| | | of batteries that differ in voltage output by slight amounts.
| | Lithiums, I
| | | believe, put out 1.55 volts per cell, and not 1.5 as do
| alkalines.
| | Also,
| | | the
| | | Ni-mhd type might put out only 1.2 volts per cell, so a bulb that
| is
| | | nominally rated for 1.5 volts would last longer (because it burns
| | cooler)
| | | on
| | | a set of Ni-mhd batteries than it would on the same set of
| lithiums.
| | But
| | | it
| | | isn't the fault of the battery type, but rather the total voltage
| | that is
| | | impressed on the bulb filament. 12 volt lead acid batteries, for
| | example,
| | | can be charged up to around 14 volts, so one should be careful
| when
| | one
| | | uses
| | | them in devices that are meant for a nominal 12 volts, not
| because of
| | | their
| | | internal resistance, but simply because 14 volts might smoke the
| | | device.........
| | |
| | |
| | |
| |
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| | | --------------------------
| | | Life is not measured by the number of breaths we take, but by the
| | moments
| | | that take our breath away. (George Carlin)
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