The answer to 'why is my circuit breaker dimming lights' is that a circuit breaker that is tripping or malfunctioning can cause lights to dim. This is often a sign of an overloaded or short-circuited electrical circuit. The circuit breaker is designed to trip and cut power when it senses too much current flowing through the circuit, which can happen when too many high-wattage devices are plugged in or if there is a problem with the wiring.
When a circuit breaker trips, it interrupts the flow of electricity and causes the lights to dim or go out completely. This is a safety feature to prevent electrical fires or damage to your home's wiring. Common causes include faulty appliances, damaged or outdated wiring, or simply having too many high-powered devices on the same circuit.