What can indicate that an electrical device may be overloaded?

All of the listed options are valid indicators that an electrical device may be overloaded, which makes the collective answer correct.

Dim lights occur when the demand for electrical current exceeds the supply, causing a drop in voltage that dims the lighting. This is a common sign of an overloaded circuit, as the electrical system struggles to distribute enough power to all connected devices.

Hot wires can indicate overload as well. When too much current flows through a wire, it generates excessive heat due to resistance in the conductors. This not only suggests an overload but also poses significant safety risks, as hot wires can lead to insulation breakdown and potentially cause electrical fires.

Frequent tripping of circuit breakers is another clear sign of an overload. Circuit breakers are designed to protect circuits by cutting off electrical flow when they detect current levels beyond their rating. If breakers are tripping often, it's likely that the devices on that circuit are drawing more current than the system can handle safely.

Thus, each of these signs contributes to an understanding that an electrical device or circuit may be experiencing an overload condition, confirming that the complete answer is indeed all of the above.