Electrical Calculator — No. 05
Ohm’s Law
Calculator
Voltage, Current, Resistance aur Power — 3 modes mein calculate karo. Ek value daalo, baaki teen instantly milenge.
Calculator
Koi Bhi 2 Values Daalo
Mode select karo — jo 2 values pata hain wo daalo — baaki sab calculate ho jayega.
Ohm’s Law Triangle
V = I × R
I = V ÷ R
R = V ÷ I
P = V × I
R = V ÷ I | P = V × I
Supply voltage in Volts
Valid voltage > 0
Current in Amperes
Valid current > 0
I = V ÷ R | P = V² ÷ R
Supply voltage in Volts
Valid voltage > 0
Resistance in Ohms
Valid resistance > 0
V = I × R | P = I² × R
Current in Amperes
Valid current > 0
Resistance in Ohms
Valid resistance > 0
Results — All Values
Voltage
—V
V = I × R
Current
—A
I = V ÷ R
Resistance
—Ω
R = V ÷ I
Power (Watt)
—W
P = V × I = I² × R = V² ÷ R
Theory + Site Knowledge
Ohm’s Law — Kya Hota Hai?
Bhai, electrical ka pehla sabak yehi hai. Gulf ki kisi bhi site pe — Qatar University ho, Sidra Hospital ho ya koi choti si DB panel — agar Ohm’s Law clear nahi to troubleshooting possible nahi. Main Mohammad Arif hoon, 12+ saal se yeh law daily use karta hoon.
Ohm’s Law kehta hai: Voltage = Current × Resistance. Itna simple. Lekin iska application infinite hai.
Ohm’s Law Formula — Teeno Forms
V = I × R (Voltage nikaalna ho tab)
I = V ÷ R (Current nikaalna ho tab)
R = V ÷ I (Resistance nikaalna ho tab)
I = V ÷ R (Current nikaalna ho tab)
R = V ÷ I (Resistance nikaalna ho tab)
Power Formula — Watt’s Law
Power (Watt) Ohm’s Law se directly derived hota hai:
P = V × I (basic form)
P = I² × R (jab V pata na ho)
P = V² ÷ R (jab I pata na ho)
P = I² × R (jab V pata na ho)
P = V² ÷ R (jab I pata na ho)
Gulf Site Real Example
Sidra Hospital Site Example
Problem: Ek heater 230V pe connected hai, resistance 46Ω hai. Current aur power kya hogi?
I = V ÷ R = 230 ÷ 46 = 5 A
P = V × I = 230 × 5 = 1150 W (1.15 kW)
MCB size: 5A × 1.25 = 6.25A → 10A MCB lagao
Ohm’s Law Kahan Kaam Aata Hai?
| Application | Formula Used | Gulf Context |
|---|---|---|
| Cable resistance check | R = V ÷ I | Voltage drop calculation |
| MCB size decide karna | I = V ÷ R | Load current find karo |
| Heater/Motor power | P = V × I | DB load calculation |
| Fault current | I = V ÷ R_fault | Short circuit analysis |
| Resistor selection | R = V ÷ I | Control panel design |
⚠ AC circuits mein dhyan do: Ohm’s Law purely resistive loads ke liye exactly kaam karta hai. Motors aur transformers mein Impedance (Z) use hoti hai — R nahi. kW to Amp Calculator use karo motor current ke liye.
🔗 Related Calculators:
kW to Amp Calculator | HP to kW Calculator | Motor Starting Calculator | Power Factor Calculator
🔗 Related Posts:
House Wiring Electrical Basics | MCB vs MCCB vs RCBO | What is Electricity?
kW to Amp Calculator | HP to kW Calculator | Motor Starting Calculator | Power Factor Calculator
🔗 Related Posts:
House Wiring Electrical Basics | MCB vs MCCB vs RCBO | What is Electricity?
Frequently Asked Questions
DC circuits mein Ohm’s Law bilkul perfectly kaam karta hai — V = IR, simple. AC circuits mein purely resistive loads (heater, bulb, geyser) pe bhi kaam karta hai. Lekin jab inductance ya capacitance ho — jaise motors, transformers, capacitors — tab resistance ki jagah Impedance (Z) use hoti hai aur formula ban jaata hai V = IZ. Gulf ki industrial sites pe mostly motors hain isliye power factor bhi consider karna padta hai.
Ohm’s Law se samajho: I = V ÷ R. Short circuit mein R almost zero ho jaata hai — isliye current theoretically infinite ho jaati hai. Practically cable ka resistance aur source impedance kuch limit karta hai, but current bahut high ho jaati hai. Isliye MCB/MCCB lagate hain — woh instantly trip ho jaate hain. MCB vs MCCB guide mein full detail hai.
Multimeter ke ohmmeter mode se — but pehle circuit ka power OFF karo aur capacitors discharge karo. Live circuit mein resistance nahi measure karte. Alternative method: voltage aur current measure karo, phir R = V ÷ I formula se calculate karo. DB PPM ke dauran insulation resistance Megger se measure hota hai — jo much higher values mein hoti hai (Megaohms mein).
Common questions: “V = IR explain karo with example”, “Agar voltage double ho to current kya hogi?”, “Series aur parallel circuits mein resistance kaise calculate karte hain?”, “Power formula derive karo Ohm’s Law se”. Gulf interview complete guide mein in sabka jawab taiyar hai.
Series: R_total = R1 + R2 + R3 — current ka ek hi rasta hota hai, sab resistances add hote hain. Parallel: 1/R_total = 1/R1 + 1/R2 + 1/R3 — current ke alag raste hain, total resistance ghatti hai. Ghar ki wiring parallel hoti hai — har socket ko full 230V milta hai. Series fault detection mein kaam aata hai jaise circuit breaker troubleshooting mein.
