Hi all,
It is said that if you connect two batteries of different values in parallel,them the lower value will be obtained as output.If that is the case then how is it that a 7 segment led connected in common anode configuration with single resistor work?..because no two diodes will have the same cut in voltage and you can still get a display with all 7 led's glowing eg:no.8 for a 7segment display
Hi all,
It is said that if you connect two batteries of different values in parallel,them the lower value will be obtained as output.If that is the case then how is it that a 7 segment led connected in common anode configuration with single resistor work?..because no two diodes will have the same cut in voltage and you can still get a display with all 7 led's glowing eg:no.8 for a 7segment display
Hi Rezer, if what you said is correct then could you please tell me what would be the output if you connect two batteries ie. a 5V and a 0V in parallel?
Two "ideal" sources, 5v and 0v connected in parallel would result in an infinite current flow.
As the sources are ideal there is no resistance, so there is no power dissipation.
In the real world, there would be a big flash and a bang and the power supplies would be reduced to a smoking wreck.
Hi Rezer, if what you said is correct then could you please tell me what would be the output if you connect two batteries ie. a 5V and a 0V in parallel?
Ideally, or should I say realistically, the voltage out will be 5V unless the charge current of the discharged battery exceeds the AH rating of the good battery, in which case, your good battery will discharge fairly quickly. But I don't really understand the question. You wouldn't charge a battery using another battery.
But back to your original post, to connect two batteries of different voltages in parallel would not be a good practice. The lower would be over-charged by the higher. I assume you were asking this as a hypothetical question as related to the LEDs, and not something you would actually do in practice?
Hi Rezer,
Indeed the question is a hypothetical one,but my original question was the case of LED display and i still do not understand why it happens like that.
how is it that a 7 segment led connected in common anode configuration with single resistor work?..because no two diodes will have the same cut in voltage and you can still get a display with all 7 led's glowing eg:no.8 for a 7segment display