Energy can be transferred from place to place by electric currents.
Electric currents flowing through a simple circuit can be used to
produce motion, sound, heat, or light. Some materials allow electricity
to flow through a circuit and some do not. Explain how electrical energy
can be transformed into other forms of energy (including motion, sound)
heat, or light). Write a paragraph to explain your thinking.

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.