Direct answer: If an outlet shows power but a plugged-in device will not run, the problem is usually not the breaker. Most often it is a bad device, a switched half-hot outlet, weak contact inside a worn outlet, or a loose connection that can still fool a simple tester.
Most likely: Start by proving the device works somewhere else, then check whether only one half of the outlet is live or whether a wall switch controls it.
This symptom trips people up because 'has power' can mean very different things in the field. A lamp that will not turn on, a charger that fits loosely, or an outlet tester that shows a light all point in different directions. Reality check: a glowing tester is not the same as a healthy outlet under load. Common wrong move: swapping the receptacle before checking the device and any nearby wall switch.
Don’t start with: Do not replace the outlet just because a non-contact tester lights up. Those testers can show voltage even when the outlet cannot carry a load safely.
A non-contact tester or outlet tester shows power, but the lamp, vacuum, heater, or charger does not actually work there.
Start here: First prove the device works on a different known-good outlet. Then check whether this outlet is switched or only partly live.
The top and bottom halves of the same outlet act differently.
Start here: Look for a nearby wall switch. This is often a half-hot outlet, not a failed receptacle.
The cord cap wiggles, falls out, or the device works only if the plug is held a certain way.
Start here: Stop using that outlet for anything with a real load. Worn internal contacts are common and can overheat.
A phone charger or tester seems fine, but a lamp, vacuum, space heater, or other larger load will not run.
Start here: Suspect weak outlet contact or a loose wire connection that shows voltage but cannot carry load reliably.
This is still the most common outcome. A dead lamp bulb, failed charger block, tripped tool, or bad appliance gets blamed on the outlet all the time.
Quick check: Plug the same device into a different outlet you know works, and plug a simple working lamp into the suspect outlet.
Living rooms and bedrooms often have one half of an outlet controlled by a wall switch. Homeowners miss this constantly after moving furniture or changing lamps.
Quick check: Flip nearby wall switches one at a time and test both the top and bottom socket separately.
If plugs feel loose, small testers may still show power while real loads fail or cut out. That is a classic worn receptacle symptom.
Quick check: With power off, inspect for a loose faceplate, cracked body, discoloration, or a plug that no longer grips firmly.
A loose backstab or terminal connection can leave you with ghost voltage or voltage that collapses under load. Heat, buzzing, or intermittent operation often show up first.
Quick check: If the outlet ever felt warm, buzzed, sparked, or worked only when the plug moved, stop and treat it as a loose-connection hazard.
You want to separate a bad device from a bad outlet before you touch any wiring. That saves time and keeps you out of the wall unless you need to go there.
Next move: If the device fails everywhere, the outlet is probably not the problem. If the known-good lamp also fails at the suspect outlet, keep going. If the device works elsewhere but not here, focus on the outlet and how it is fed.
What to conclude: This tells you whether you are chasing an outlet problem or a device problem. It also helps expose outlets that only show voltage on a tester but cannot run a real load.
One dead half of an otherwise live outlet is often intentional. This is especially common where a floor lamp was meant to be switch-controlled.
Next move: If the outlet works when the switch is on, or only one half is controlled, you found the reason. If both halves stay dead under load or act loose and intermittent, continue to the outlet condition checks.
What to conclude: A switched half-hot outlet is normal wiring, not a bad receptacle. If the behavior changed recently without any switch involvement before, then a loose tab or wiring issue becomes more likely and that is pro territory.
A worn receptacle can still test live but fail under load. Loose plug grip is one of the clearest homeowner-level clues.
Next move: If the plug grip is loose or the outlet body is damaged, replacing the outlet is a reasonable next repair path once power is safely off and the circuit is identified. If the outlet looks sound and grips well, the problem may be a loose wire connection at this outlet or upstream.
At this point the easy lookalikes are separated. The next move depends on whether you have a plain worn receptacle or signs of a loose connection in the box.
Next move: If you have a plain worn outlet with no damage signs, replacing the outlet with the same type is the supported repair path. If the outlet is GFCI type and will not reset, or if there are loose-connection clues, do not guess. Replace only the confirmed failed outlet type or call a pro.
The goal is not just to make the tester light up again. You want an outlet that holds a plug firmly, runs a normal load, and stays cool.
A good result: A successful repair means the plug fits snugly, both intended sockets behave normally, and a real device runs without flicker, heat, or cutout.
If not: If the new outlet does not fix it, the fault is likely in the wiring, another outlet on the run, a switch leg, or a hidden connection problem.
What to conclude: When a replacement outlet does not solve it, the receptacle was not the whole story. The safe next action is circuit diagnosis, not more guess-and-swap.
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Because a tester can detect voltage even when the outlet cannot carry a real load properly. A worn receptacle or loose wire can fool a simple tester. Always confirm with a known-good device, not just a glowing tester.
Yes. That is common with a switched half-hot outlet, where one socket is controlled by a wall switch and the other stays live all the time. Check nearby switches before assuming the outlet failed.
Yes. Loose plug grip usually means the outlet contacts are worn. That can cause intermittent power and heat buildup, especially with larger loads. Stop using that outlet until it is repaired.
Maybe, but confirm the pattern first. Small chargers can sometimes work on an outlet that has weak contact or a loose connection, while larger loads fail. If the plug is loose or the outlet shows wear, replacement is reasonable. If there is heat, buzzing, or burn smell, call a pro.
Then the problem is likely upstream in the wiring, another outlet on the circuit, a switch-controlled leg, or a loose connection in the box. Stop swapping parts and have the circuit diagnosed professionally.
No. Intermittent outlets are often loose-connection problems, and those are the ones that can heat up and fail badly. Leave it unused until you know whether it is just a worn receptacle or something more serious.