A100-w light bulb is plugged into a standard 120 v outlet. how much does it cost per month (31 days) to leave the light turned on?

4.836 dollars

Explanation:

When the power in watts is multiplied by the amount of time the power is used we get the power in the following form.

The power in kWh is

Cost of kWh = 6.5 cents (assumed)

Cost in a month is given by

The cost per month is 4.836 dollars per 31 days

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