If the surveillance camera provides him with a large current, pay attention to the current, not the voltage, and the voltage is 12V, then what will happen to the camera?

The camera will work normally and there will be no other phenomena.

Because if the voltage is 12V, the current is also certain, and the current is determined by the DC impedance of the camera.

For example, the standard adaptive power supply for a camera is12v/1a. If the power supply of 12V/5A or 10A and 20A is the same, it will have no effect on the camera.

Extended data

Impedance is a physical quantity representing the performance of components or the electrical performance of circuits. The ratio of the peak voltage (or effective value) Um at both ends of the passive circuit in an AC circuit to the peak current (or effective value) Im passing through the circuit is called impedance, which is expressed by z and the unit is ohm (ω). Under the condition of constant u, the larger z is, the smaller I is, and the impedance has a limiting effect on the current.

Monitor the expressive force of the camera: When choosing a lens, many people first pay attention to the clarity of the lens, and the purpose of the photo determines what kind of clear lens is needed. High-priced high-quality lenses are mainly used by professional photographers. If it's just general photography, there's no need to spend a lot of money on expensive and high-quality lenses.

reference data

Baidu encyclopedia-impedance

Baidu encyclopedia-monitoring camera