Explanation:

When a circuit is overloaded, it means that the current flowing through it exceeds its rated capacity. This can happen when too many devices are connected to a circuit that cannot handle the load.

Effects of Overloading:
1. Increased Current: When a circuit is overloaded, the current flowing through it increases. This is because the devices connected to the circuit draw more current than the circuit is designed to handle.

2. Heat Generation: The increased current leads to increased heat generation in the circuit components, such as wires, switches, and connectors. This can cause damage to the components and increase the risk of fire.

3. Voltage Drop: Overloading can also lead to a voltage drop in the circuit. This means that the voltage supplied to the devices connected to the circuit decreases, which can affect their performance.

Effect on Current:
The correct answer to the given question is option 'B' - More. When a circuit is overloaded, the current flowing through it increases. This is because the devices connected to the circuit draw more current than the circuit can provide.

Reason:
The reason behind the increase in current is Ohm's Law, which states that the current flowing through a circuit is directly proportional to the voltage and inversely proportional to the resistance. When the voltage supplied to the circuit remains constant and the resistance of the circuit remains the same, an increase in current can only occur if the devices connected to the circuit draw more current.

Therefore, when a circuit is overloaded, the current flowing through it becomes more than the rated capacity of the circuit. This can lead to overheating, voltage drop, and damage to the circuit components. It is important to avoid overloading circuits to ensure their safe and efficient operation.