• Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

New Projects | Privacy Policy | About us | Contact | Disclaimer | Copyright | Videos 

Ohm’s Law Calculator

Calculate circuit parameters using Ohm's Law

Enter any two known values and press "Calculate" to solve for the others.
(V)
(A)
(‎Ω)
(W)
 
 

Reader Interactions

Comments

  1. Ksmani says

    May 1, 2019

    Need to make variable DC power supply 0 -100 v current 2 amps. With coarce snd fine addjustments for voltage with 3 1/2 digit meters for both volt and current

    Reply
    • Swagatam says

      May 1, 2019

      If you use a linear approach, there will be a lot of heat dissipation. Better to use a transformer based design.

      A linear design is shown below:

      https://www.homemade-circuits.com/universal-variable-power-supply-circuit/

      you can upgrade it to 100V by replacing the power transistors accordingly, and by changing R3 to 10K 1 watt

      Reply
  2. moboy says

    January 31, 2019

    Hi Swatagam, could you please explain to me in detail the formula, resistance in parallel. I understand how to calculate for two resistors in parallel but don’t know how to calculate for more then two, beyond many textbooks just stating the formula as 1\R1+ R2+R3+R4…. Please detail this concept of reciprocals. P.s. I’m a hobbyist.
    Thank you very much for caring and sharing such a wonderful site. P.s. I’m a hobbyist.

    Reply
    • Swagatam says

      January 31, 2019

      Thank you moboy, It is actually very basic, here’s the formula for calculating resistors in parallel:

      1/R = 1/R1 + 1/R2 + 1/R3….1/Rn

      Reply

Have Questions? Please post your comments below for quick replies! Comments should be related to the above artcile Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

Categories

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (52)
  • 4060 IC Circuits (26)
  • 555 IC Circuits (99)
  • 741 IC Circuits (20)
  • Arduino Engineering Projects (83)
  • Audio and Amplifier Projects (115)
  • Battery Chargers (83)
  • Car and Motorcycle (95)
  • Datasheets (74)
  • Decorative Lighting (Diwali, Christmas) (33)
  • Electronic Components (101)
  • Electronic Devices and Circuit Theory (36)
  • Electronics Tutorial (120)
  • Fish Aquarium (5)
  • Free Energy (34)
  • Fun Projects (13)
  • GSM Projects (9)
  • Health Related (20)
  • Heater Controllers (29)
  • Home Electrical Circuits (104)
  • How to Articles (20)
  • Incubator Related (6)
  • Industrial Electronics (28)
  • Infrared (IR) (40)
  • Inverter Circuits (98)
  • Laser Projects (12)
  • LED and Light Effect (93)
  • LM317/LM338 (21)
  • LM3915 IC (25)
  • Meters and Testers (66)
  • Mini Projects (150)
  • Motor Controller (67)
  • MPPT (7)
  • Oscillator Circuits (26)
  • PIR (Passive Infrared) (8)
  • Power Electronics (34)
  • Power Supply Circuits (79)
  • Radio Circuits (10)
  • Remote Control (48)
  • Security and Alarm (62)
  • Sensors and Detectors (121)
  • SG3525 IC (5)
  • Simple Circuits (75)
  • SMPS (29)
  • Solar Controllers (61)
  • Timer and Delay Relay (53)
  • TL494 IC (5)
  • Transformerless Power Supply (8)
  • Transmitter Circuits (41)
  • Ultrasonic Projects (16)
  • Water Level Controller (45)

Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

© 2023 · Swagatam Innovations