ohms law

  1. EUrbanAutoTech

    If V = I x R then does it still "make sense" to refer to a battery's voltage when not connected to anything? As in I = 0..?

    I'm an automotive mechanic that specializes in electrical/drivability diagnosis. I like helping other techs get a better grasp on this aspect of our trade. Now imagine I'm with another tech and I have a battery and a multimeter in front of me. I measure the battery's voltage and get 12V. Me...
  2. abdaelawad

    Calculate the voltage V4 and current i6 of the circuit in the figure using only Kirchhoff and law of nodes and meshes

    I tried to solve the equations I got but when I make substitutions I get to a deadlock where I can't substitute anything anymore. The equations I obtained are: i2=i1+i2 i3=i4+i5 i5=i7-i6 i2=i4+i6 3i2-i1R1-i5R2=0 2v-i2R3=0 -i6R4+2v-i5R2=0 Could someone help me understand step by step what...
  3. effectivedragon

    Question regarding water resistance changing with voltage

    Hi, recently I have been trying to find out regarding resistance of water at high voltages. I may seem oddly obsessed with this but it is forming a big part of a science project I am doing revolving around electrical safety with water and wet things, using detailed resistance values to back...
  4. piBoss

    22v DC to 12v DC of Charger

    Okay, I'm a EE who never worked in the industry and finished school in 1988 so please keep the laughter to a minimum lol. All is DC I have a battery charger from a Hoover Vacuum that puts out 22v, 2A. I desire to use it as a 12v charger. Is this as simple as placing a 5 Ohm resister in the...
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