Four resistors with current ratings of 1, 2, 3, and 4 amperes are connected in series. What is the maximum current permissible in this circuit to prevent overload?

In a series circuit, the same current flows through each component connected in the circuit. The maximum permissible current in this case is determined by the component with the lowest current rating. Since the resistors have current ratings of 1, 2, 3, and 4 amperes, the resistor rated at 1 ampere will limit the current throughout the entire circuit.

If the current exceeds 1 ampere, the 1 ampere resistor would likely overheat and potentially get damaged, leading to an overload situation. Therefore, the maximum permissible current for the circuit to prevent overload is 1 ampere, ensuring that all components operate safely within their rated limits.