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Electrical calculators.

Fast calculations with formulas, units and practical interpretation. Change any value and the result updates immediately—no registration or installation.

EIGHT INTERACTIVE TOOLS

Calculate and understand.

Each card shows the equation used, so students can connect the numerical result with the underlying electrical concept.

CALCULATOR 01

Three-phase line current

Power (kW)Line voltage (V)Power factorEfficiency

90.93 Aline current

I = P ÷ (√3 × V × PF × η)

CALCULATOR 02

Power-factor correction

Active power (kW)Existing PFTarget PF

55.32 kVArcapacitor-bank requirement

Qc = P[tan(cos⁻¹ PF₁) − tan(cos⁻¹ PF₂)]

CALCULATOR 03

Motor slip and rotor speed

Frequency (Hz)Number of polesRotor speed (rpm)

Ns = 1500 rpmslip = 4.00%

Ns = 120f/P · Slip = (Ns − N)/Ns

CALCULATOR 04

Battery backup time

Battery voltage (V)Capacity (Ah)Load (W)Usable fraction × efficiency

3.46 hoursestimated backup

Time = V × Ah × usable fraction ÷ load

CALCULATOR 05

Single-phase voltage drop

Current (A)One-way length (m)Cable resistance (Ω/km)Supply voltage (V)

5.53 V2.41% voltage drop

Approximation: ΔV = 2ILR/1000; reactance omitted.

CALCULATOR 06

Transformer efficiency

Output power (kW)Iron loss (kW)Copper loss (kW)

96.04%efficiency at this load

η = output ÷ (output + iron loss + copper loss)

CALCULATOR 07

Energy consumption and cost

Load (W)Hours per dayNumber of daysTariff (₹/kWh)

240.00 kWhestimated charge: ₹1680.00

Energy = W × hours × days ÷ 1000

CALCULATOR 08

Star–delta relationships

Line voltage (V)Line current (A)Connection

Vph = 239.60 VIph = 10.00 A

Star: Vph = VL/√3, Iph = IL · Delta: Vph = VL, Iph = IL/√3