Please answer the following questions in writing before coming to lab 9. You will be handing them in and they will make up part of your lab 9 grade.

1. What are the differences between these two physical quantities: electric current I, voltage Delta V?
2. Draw a complete circuit with a battery, switch, and an incandescent light bulb that results in the bulb lighting up. Explain the mechanism behind the emission of light from an incandescent bulb.
3. Draw a complete circuit with a battery, switch and a commercial resistor. Describe an experiment that would let you create a function I(Delta V) for the resistor? That is, a mathematical function describing how the current through the resistor depends on the voltage across it. Based on your understanding of resistors, sketch a graph of what this function will look like. How would the graph be different if the resistance of the resistor were greater? Explain.
4. What physical quantities do you need to measure to determine the electric power dissipated by a particular circuit element? What mathematical procedure will you use?
5. What are the differences between the mechanisms of electric conductivity in metals vs. semiconductors?

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

i think its c if i'm wrong

it's a b and

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.