The answer to 'why is my circuit breaker' is that a circuit breaker can trip for a few common reasons, such as an overloaded circuit, a short circuit, or a ground fault. When a circuit breaker trips, it cuts off power to that circuit to prevent damage or a fire.
Some common symptoms of a tripped circuit breaker include lights or appliances not working, a burning smell, or sparks. To reset the breaker, simply flip it back to the 'on' position. However, you should investigate the underlying cause to prevent it from happening again. If the breaker keeps tripping, it's best to call a licensed electrician to inspect the wiring and identify the issue.