Hi all!
I'm looking forward to learning a lot on this forum! I loved the e-book.
What I'm doing I have a 12vdc 500mA power supply. Problem is the battery I'm charging is a 9.6 volt battery. So I'd like to drop the power supply down to ~9.6volts or so. But I'd still like to deliver the 500mA to the battery for charging. (That is the max it is rated to take for a charge).
I've applied Ohm's law and think I need a 4.8Ohm resister in the circuit. From what I learned on the site, I'm thinking the resistor and the battery pack should be in series. My thought is: In series the current is constant in the circuit and the voltage changes, thus the batt pack with get 9.6 volts and the resistor will get 2.4.
My power calculation shows the resistor will eat about 1.2 watts.
My issue is, when I do the math on the battery pack it comes up that it would have a -500mA current and the resistor would have a +500mA current. Which I guess makes sense that they equal 0... but wouldn't I want the positive current to flow into the battery I'm charging.. thus charging the battery?
This part confuses me. I may be completely off track, so any assistance would be great!
Thanks for any assistance!
I'm looking forward to learning a lot on this forum! I loved the e-book.
What I'm doing I have a 12vdc 500mA power supply. Problem is the battery I'm charging is a 9.6 volt battery. So I'd like to drop the power supply down to ~9.6volts or so. But I'd still like to deliver the 500mA to the battery for charging. (That is the max it is rated to take for a charge).
I've applied Ohm's law and think I need a 4.8Ohm resister in the circuit. From what I learned on the site, I'm thinking the resistor and the battery pack should be in series. My thought is: In series the current is constant in the circuit and the voltage changes, thus the batt pack with get 9.6 volts and the resistor will get 2.4.
My power calculation shows the resistor will eat about 1.2 watts.
My issue is, when I do the math on the battery pack it comes up that it would have a -500mA current and the resistor would have a +500mA current. Which I guess makes sense that they equal 0... but wouldn't I want the positive current to flow into the battery I'm charging.. thus charging the battery?
This part confuses me. I may be completely off track, so any assistance would be great!
Thanks for any assistance!