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Flow of electric charge - typically movement of charge carriers, such as electrons. Measured in amperes (A).

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Display of set current on a variable bench power supply

If I understood you correctly you are designing a bench supply that will work as a voltage source but the current is capped at some user defined value. … Then you have a very small resistor which is rated for high current (R1) (search for current sense resistor) and connect it to an operational amplifier (OA1). …
caconyrn's user avatar
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1 vote

Current division into three branches

Once you know the current, you can focus on the more simplified branch (but now knowing how much current flows through it as a whole), split it into two R's again and apply the familiar rule. … ; now you know the current over R10 and R3 Take R10 and calculate current between R8 and R5 …
caconyrn's user avatar
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Simplest "battery low" indicator for a 3.7 volt lithium ion battery

If not, you need to build a small circuit that produces a voltage independent of the battery voltage: The easiest solution is to utilize a zener diode in reverse bias (and a current limiting resistor.) … voltages lower than 3.3V (V_th); that means you calculate $$ \frac{V_{threshold} * R3}{R2 + R3} = V_{@inverting} $$ where you arbitrarily choose R3 to have some resonable resistance (based on how much current
caconyrn's user avatar
  • 301