Newspaper articles often have statements such as \"10,000 volts of electricity s
ID: 1452349 • Letter: N
Question
Newspaper articles often have statements such as "10,000 volts of electricity surged through the victim's body." What is wrong with this statement? Some homes have light dimmers that are operated by rotation of a knob. What is being changed m the electric circuit when the knob is rotated and how does it change the amount of light in the room? You have learned that drift velocities of electrons inside wires is very, very small. Yet, when into a room and flip the light switch, lights come on almost immediately. How is this possible? Why don't the free electrons in a metal fall to the bottom of the metal due to gravity? Incandescent lights waste much of their energy as heat. Explain, on the atomic level, where this heat is coming from.Explanation / Answer
(a)
10,000 V of electric current is the correct usage
(b)
the dimness of the bulb depends on the current in through the bulb. The current changes by rotatign the knob.
(c)
immediately turn on the switch, the electrons near the switch accelerates the near electrons, and an electric wave and this wave propagates with the same speed of the electrons.
(d)
the mass of the electrons is very small. so, gravity will be neglected. The gravitational force is very small compared tio the electrostatic attraction on the free electrns due to the nuclues.