Draw an i-v curve (current vs. voltage) for a metallic resistor. 2) add an i-v curve with a different color for a resistor with higher resistance than the previous one. 3) draw an i-v curve for a light bulb. (note that the filament in the light bulb is tungsten, a metal with a high melting point, gets hotter with more applied voltage. for metals, the resistance increases with temperature.)

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

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle