How to calculate it?
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I study chemical engineering; I don’t understand electricity. I have a lithium battery with a voltage of 2.2 volts, and I want to use it as a power source for an MP3 player. However, the MP3 player requires 1.5 volts. Do I need to connect a resistor in series? How should the resistance value be calculated? What power rating should the resistor have to ensure proper operation? Please advise!
Series resistance won’t work; could series diodes be considered, but it hasn’t been tried yet.
It is recommended not to consider methods such as using series resistors, as they are not feasible in principle; you can find out the specific reasons by reading some books – it’s better to simply buy a new battery.
Use one IN4001 diode; the voltage range is 2.2V–0.7V, which gives 1.5V (the forward voltage drop of a silicon diode is 0.7V). Be careful to insert it with the correct polarity – the negative terminal of the diode should be connected to the positive terminal of the battery. That’s it!
It is 0 under any conditions. 7V voltage drop? . . . ? :o