What Is Voltage Drop?
Voltage Drop is the reduction in electrical voltage that occurs as current travels through a conductor, connection, or circuit component. The reduction results from the electrical resistance of the path. Excessive voltage drop can make equipment operate poorly, cause lights to dim, or prevent a load from starting correctly.
Quick Facts About Voltage Drop
Category
Electrical measurement
Used for
Circuit troubleshooting
Common confusion
Mistaken for low utility voltage
Also called
Voltage loss
Often discussed with
Electrical Troubleshooting
Key Takeaways About Voltage Drop
- Voltage Drop occurs along the circuit path.
- Longer runs and poor connections can increase the reduction.
- Voltage Drop is not the same as a tripped breaker.
How Voltage Drop Works
Voltage Drop occurs as electrical current moves through a circuit and meets resistance in the conductors, terminals, or connected components. The power source sends voltage into the circuit, while the load receives less voltage after energy is lost along the path. Wire length, conductor condition, connection quality, and load demand all affect the result.
Related glossary terms: Multimeter, Continuity Test, Neutral Conductor.
An electrician checks voltage at the power source and again at the load with a multimeter. The difference between those readings shows how much voltage the circuit loses during operation. A loose terminal may create a localized drop, while a long run may spread the reduction across the circuit. The observed pattern helps separate a wiring issue from a problem inside the equipment.
From the GMB Electric team
When we troubleshoot a suspected Voltage Drop, we test the circuit under load and compare readings at the source, connections, and equipment. Our team also checks terminals and conductor condition because a sound reading with no load may not reveal a problem during operation.
Voltage Drop in Practice: A Real-World Example
A kitchen circuit may show normal voltage at the panel but noticeably lower voltage at an appliance while the appliance runs. Electrical troubleshooting traces the difference through the wiring and connections to identify the point causing the drop.
Related Services
Related Terms
Multimeter
A multimeter is a handheld electrical testing instrument that measures values such as voltage, current, and…
Continuity Test
A continuity test is an electrical check that determines whether a circuit path is complete from…
Neutral Conductor
A neutral conductor is a current-carrying wire that provides the normal return path from a circuit…
Circuit Breaker
A Circuit Breaker is a resettable electrical switching device that opens a circuit when current exceeds…
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Have Questions About Voltage Drop?
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