In chemistry you learned about open and closed systems. Which of the following is a true statement about the human body. O A. The human body is a closed system because matter and energy move from one part of the body to another.
OB. The human body is an open system because you need to take in air and food for the body to function.
OC. The human body is a closed system because normally the organs, tissues, and cells are all internal to the body.
D. The human body is an open system because the circulatory system moves food around from one part of the body to another.

v=ir = 3x15 =45 v

current flows in a wire

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia