What does a spark in an electrical outlet mean?

A spark in a wall electrical outlet generally signifies that electrical current is momentarily or continuously jumping through the air across a gap between contact points, which can stem from normal minor micro-arcing or dangerous wiring faults. While a tiny, instantaneous flash can happen when plugging in high-draw appliances due to inrush current, larger or persistent sparks indicate worn-out internal contact springs, loose terminal screw connections creating high resistance, frayed cords, or short circuits. You can troubleshoot electrical faults safely by shutting off the breaker. You can verify that your corrective action is successful when tightening loose terminal wires, replacing damaged cords, or installing a new receptacle stops abnormal sparking completely and ensures safe power delivery.