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Electrical Resistance & Heating Element Calculator

COMPUTE OHMS, AMPS & POWER FOR 1-PHASE AND 3-PHASE STAR / DELTA HEATING BANKS

Electrical Calculation Results

Total System Heating Power (kW) --
Resistance per Element (Ω) --
Total Line Current (A) --
Element Phase Current (A) --
Voltage Across Each Element (V) --
⚠️ Star (Y) vs Delta (Δ) Comparison Warning: Re-wiring a 3-phase heater from Delta (Δ) to Star (Y) reduces total heating output to exactly 1/3 (33.3%) of its rated power.

Ohm’s Law & 3-Phase Heating Formulas

Delta: P = 3 × (V_line² / R) | Star: P = V_line² / R

Electric heaters convert electrical energy into thermal energy. In 3-phase heating banks, Delta connection places full line voltage across each element, while Star connection reduces element voltage to Line Voltage / √3.

Frequently Asked Questions

What happens if I connect a Delta heater in Star?

If a 3-phase heating element bank designed for Delta (400V across each element) is wired in Star, each element receives only 230V (V_line / √3). Since power is proportional to voltage squared (V²), the total heating power drops to 1/3 (33.3%) of original power.

How do I calculate 3-phase Delta heating current?

In Delta (Δ) connection, line current I_line = √3 × I_phase. Each element sees full line voltage (V_line). Line Current I_line = (Total kW × 1000) / (√3 × V_line).

How do I calculate 3-phase Star heating current?

In Star (Y) connection, line current equals phase current (I_line = I_phase). Voltage across each element is V_line / √3 (e.g. 230V on a 400V line). Line Current I_line = (Total kW × 1000) / (√3 × V_line).