Circuit Resistance Calculator

Calculate current per detonator for electric circuits

Circuit Parameters

Number of detonators

dets

Detonators in series in the circuit

Resistance per detonator

See manufacturer specifications

Lead wire resistance

Optional (default: 0)

Available voltage

Blasting machine voltage

Total resistance

Enter values

Minimum current per detonator≥ 1.5 A

For instantaneous detonators in series. Recommended: 50%+ safety margin.

R_total = (n × R_det) + R_lead

Total series circuit resistance

I = V ÷ R_total

Ohm's Law

I_det = I ÷ n

Current per detonator (series)

Always verify circuit with ohmmeter before firing