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How to hook up two or three amps?

How can I get 1.5 amps and 3v output with a three volt input and two 1ohm resistors?

  • I have two 1 ohm resistors (rated at 10w of course!) and I want to use a 3V input and get 2.8-3.0V output but I think if i just put them in series and I use R = V/I i get 2ohms=x volts/1.5 amps but then i get three for the volts which wouldn't that be a three volt drop giving me 0 volts output? Am i doing that wrong? if i'm doing it right is there any other way i can wire it like using a parallel circuit or something? thank you in advance.

  • Answer:

    You need resistors with much less than one ohm. A 10 amp fuse might drop 0.1 volts at 1.5 amps. That would be 0.06666 ohms. Try different brands and ratings of MDL = medium delay = common type of small fuse, till you get about 2.9 volts out at 1.5 amps. You did not say what the load is? If you use the two 1 ohm resistor in series = 2 ohms as the load; A = V/R =3/2 = 1.5 amps, a bit less for 2.8 volts. Likely the last sentence answers the question which was not worded correctly. Neil

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You need resistors with much less than one ohm. A 10 amp fuse might drop 0.1 volts at 1.5 amps. That would be 0.06666 ohms. Try different brands and ratings of MDL = medium delay = common type of small fuse, till you get about 2.9 volts out at 1.5 amps. You did not say what the load is? If you use the two 1 ohm resistor in series = 2 ohms as the load; A = V/R =3/2 = 1.5 amps, a bit less for 2.8 volts. Likely the last sentence answers the question which was not worded correctly. Neil

You can place a resistance of 2 ohms across a 3V battery and get 1.5 amps. If you place other series resistors, they will drop the voltage and lessen the voltage that you will finally get across the load. *here 2 ohms). If you want a current of 1.5 amp in a cil of say 0.01 ohm *negligible) resistance, place that coil in series with the 2 ohms I considered. Yes, this 2 ohms could be two 1 ohms in series.

You can place a resistance of 2 ohms across a 3V battery and get 1.5 amps. If you place other series resistors, they will drop the voltage and lessen the voltage that you will finally get across the load. *here 2 ohms). If you want a current of 1.5 amp in a cil of say 0.01 ohm *negligible) resistance, place that coil in series with the 2 ohms I considered. Yes, this 2 ohms could be two 1 ohms in series.

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