Physics 104 Solutions Symko, Chapter 5 - Electricity Questions for Review 1. When a 9-Volt battery is connected to a circuit, for instance, it supplies nine Joules of energy per coulomb of charge that passes through it. Power is measured in Watts, and is the product of voltage times current. Silicon is the basis for semiconductors and it has 4 valence electrons that contribute to bonding atoms together into solid state silicon.
Sound waves correspond to pressure fluctuations that alternate above and below atmospheric pressure.
AC voltage is a useful way to represent and process acoustic information because it corresponds to a voltage that alternates between positive and negative, with respect to some reference voltage. Resistivity is an intrinsic property, depending upon the atomic structure of the metal and the extent to which electrons are scattered by the lattice of bonded atoms as they respond to an applied voltage across the wire. Resistance is directly proportional to resistivity. The other two factors are geometric and can be understood by analogy to the flow of water in a pipe. Suppose a stream is funneled into a pipe.