A method creates a banking card that may be a wireless banking card. The banking card has an antenna with an open circuit that prevents the banking card from functioning correctly until it is received by a banking customer the card is to belong to. A cavity is formed within the banking card near the open circuit and a thin wall is created between the cavity and the open circuit. The cavity is filled with a flowable electrical conductor that may be a liquid metal such as mercury or galinstan. Instruction indications are provided on the banking card indicating to a banking customer how to manipulate the banking card to cause the liquid conductor to flow and remove the open circuit and allow the banking card to function correctly.

A method creates a banking card that may be a wireless banking card. The banking card has an antenna with an open circuit that prevents the banking card from functioning correctly until it is received by a banking customer the card is to belong to. A cavity is formed within the banking card near the open circuit and a thin wall is created between the cavity and the open circuit. The cavity is filled with a flowable electrical conductor that may be a liquid metal such as mercury or galinstan. Instruction indications are provided on the banking card indicating to a banking customer how to manipulate the banking card to cause the liquid conductor to flow and remove the open circuit and allow the banking card to function correctly.

A switch device capable of safely opening or short-circuiting an electrical circuit in response to an abnormality such as wetting with water or liquid leaking from a battery is provided. The device includes first and second conductors connected to an external circuit, and a reaction part including an insulating material which changes state on contact with a liquid, the first and second conductors being electrically connected or disconnected by the insulating material changing state on contact with the liquid.

A switch device capable of safely opening or short-circuiting an electrical circuit in response to an abnormality such as wetting with water or liquid leaking from a battery is provided. The device includes first and second conductors connected to an external circuit, and a reaction part including an insulating material which changes state on contact with a liquid, the first and second conductors being electrically connected or disconnected by the insulating material changing state on contact with the liquid.

A semiconductor device can include a first metal trace, a first via disposed on the first metal trace, a second metal trace disposed on the first via, and an insulator interposed between the first metal trace and the first via. The insulator can be configured to lower an energy barrier or redistribute structure defects or charge carriers, such that the first metal trace and the first via are electrically connected to each other when power is applied. The semiconductor device can further include a dummy via disposed on the first metal trace.

A semiconductor device can include a first metal trace, a first via disposed on the first metal trace, a second metal trace disposed on the first via, and an insulator interposed between the first metal trace and the first via. The insulator can be configured to lower an energy barrier or redistribute structure defects or charge carriers, such that the first metal trace and the first via are electrically connected to each other when power is applied. The semiconductor device can further include a dummy via disposed on the first metal trace.

A switch device capable of safely opening or short-circuiting an electrical circuit in response to an abnormality such as wetting with water or liquid leaking from a battery is provided. The device includes first and second conductors connected to an external circuit, and a reaction part including an insulating material which changes state on contact with a liquid, the first and second conductors being electrically connected or disconnected by the insulating material changing state on contact with the liquid.

A semiconductor device can include a first metal trace, a first via disposed on the first metal trace, a second metal trace disposed on the first via, and an insulator interposed between the first metal trace and the first via. The insulator can be configured to lower an energy barrier or redistribute structure defects or charge carriers, such that the first metal trace and the first via are electrically connected to each other when power is applied. The semiconductor device can further include a dummy via disposed on the first metal trace.

A semiconductor device can include a first metal trace, a first via disposed on the first metal trace, a second metal trace disposed on the first via, and an insulator interposed between the first metal trace and the first via. The insulator can be configured to lower an energy barrier or redistribute structure defects or charge carriers, such that the first metal trace and the first via are electrically connected to each other when power is applied. The semiconductor device can further include a dummy via disposed on the first metal trace.

A method creates a banking card that may be a wireless banking card. The banking card has an antenna with an open circuit that prevents the banking card from functioning correctly until it is received by a banking customer the card is to belong to. A cavity is formed within the banking card near the open circuit and a thin wall is created between the cavity and the open circuit. The cavity is filled with a flowable electrical conductor that may be a liquid metal such as mercury or galinstan. Instruction indications are provided on the banking card indicating to a banking customer how to manipulate the banking card to cause the liquid conductor to flow and remove the open circuit and allow the banking card to function correctly.