The Basics:
* Voltage: Voltage is the electrical "pressure" that pushes electrons through wires. A higher voltage means more pressure.
* Current: Current is the flow of electrons through a wire.
* Resistance: Resistance is the opposition to the flow of current.
What Happens When a Large Appliance Turns On:
1. Increased Current Draw: Large appliances like refrigerators, air conditioners, and electric heaters draw a significant amount of current when they start up.
2. Voltage Drop: This increased current flow creates resistance in the wires, causing a slight decrease in voltage (the pressure). The voltage drop is usually small, but it can be noticeable.
3. Impact on Lights: Lights are sensitive to voltage fluctuations. When the voltage drops, the lights receive less "pressure" and therefore produce less light, causing them to dim.
Why Lights Sometimes Get Brighter:
* Increased Voltage: Sometimes, when a large appliance shuts off, the voltage can actually *increase* slightly. This is because the resistance in the wiring decreases when the current draw goes down. This slight increase in voltage can cause the lights to appear brighter.
Factors Affecting the Effect:
* Appliance Size: The larger the appliance, the more current it draws, and the more likely a noticeable voltage drop will occur.
* Wiring Size: Thicker wiring has less resistance, minimizing the voltage drop. Older homes with smaller wiring are more prone to dimming issues.
* Distance from Appliance: Lights further away from the appliance will experience a smaller voltage drop than those closer.
* Type of Lights: Incandescent bulbs are more sensitive to voltage changes than LEDs.
Troubleshooting:
If you experience significant dimming or flickering, especially with older wiring, it's important to consult an electrician. They can assess your electrical system and recommend solutions like upgrading wiring or installing a larger circuit breaker.
