What Is Voltage Drop?
Voltage Drop is the reduction in electrical voltage that occurs as current travels through a conductor, connection, or device. Resistance in the circuit uses part of the available voltage. The amount depends on the circuit load, conductor characteristics, connection condition, and distance between the power source and the equipment.
Quick Facts About Voltage Drop
Category
Electrical measurement
Used for
Circuit troubleshooting
Common confusion
Confused with a short circuit
Also called
Voltage Loss
Often discussed with
Electrical Troubleshooting
Key Takeaways About Voltage Drop
- Voltage Drop occurs along conductors and connections.
- A loaded circuit reveals the condition more clearly.
- Voltage Drop is not the same as a short circuit.
How Voltage Drop Works
Voltage Drop appears as current moves through a circuit with resistance. Wire, terminals, switches, and other connections all affect the available voltage. A longer path or a connection with unwanted resistance can reduce the voltage reaching a load.
Related glossary terms: Line Voltage, Branch Circuit, Electrical Load Calculation.
An electrician checks the circuit under an operating load with a voltage meter. The source reading is compared with the reading at the equipment, which helps locate where voltage is being lost. A technician may inspect conductor size, loose terminations, damaged wiring, or overloaded circuit conditions. A motor that struggles to start or a light that dims when another load operates can point to a circuit problem, but testing identifies the actual location.
From the GMB Electric team
When we troubleshoot a circuit, we measure voltage at the source and at the equipment while the load operates. We inspect connections and conductors when the readings show an unusual difference. Our team uses those results to separate wiring problems from equipment problems.
Voltage Drop in Practice: A Real-World Example
A homeowner notices a workshop motor runs weakly when the circuit is in use. During electrical troubleshooting, we compare voltage at the panel and at the motor, then inspect the circuit path for a damaged connection or conductor issue.
Related Services
Related Terms
Line Voltage
Line voltage is the electrical potential supplied by a power source to a circuit, appliance, or…
Branch Circuit
A branch circuit is the portion of an electrical system that carries power from a panelboard…
Electrical Load Calculation
Electrical Load Calculation is a structured assessment of the electrical demand a property places on its…
Neutral Wire
Neutral wire is a current-carrying conductor that completes the electrical path from a load back to…
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Have Questions About Voltage Drop?
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