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Most LED bulbs have a plastic covering, while incandescent bulbs will be made from glass. This is because LED bulbs don’t produce as much heat as incandescent bulbs, so the covering doesn’t need to be as heat resistant. Also, an LED light bulb will usually have a marking on its base that identifies it as an LED.

Yes, blue wires can be hot wires in the U.S. However, they are less common in residential properties than red and black hot wires. Blue wires are typically used as traveler wires in three-way and four-way switches, as well as ceiling fans. They allow fixtures to be controlled by multiple switches, like when there are switches at the top and bottom of a staircase for the same light.

GFCI outlets generally need to be replaced every 7 to 15 years, though some may fail in as little as 5 years, depending on usage. It is important to test them regularly. Signs that a GFCI outlet is failing or has reached the end of its lifespan include: no power coming from the outlet, the outlet not resetting when the 'reset' button is pressed, or the outlet not tripping when the 'test' button is pressed. If you notice any of these issues, it is time to replace the outlet, and it's best to contact an electrician to do so.

To determine if an electrical outlet is blown, look for visible signs of damage such as a burning or smoky smell, burn marks, or a melted or discolored plastic cover. If you notice a burning smell, contact an electrician immediately. Other signs include a plug that keeps falling out or the outlet not working when you test it with different devices. For further troubleshooting, you can use a voltage tester or multimeter to check for power; a reading of zero indicates a problem. Also, check your circuit breaker or fuse box to see if the circuit was tripped and reset it if necessary. If these steps don't resolve the issue, the outlet may need to be replaced.