With ece hw?

1a)the concept \voltage" can be explained in di erent ways. write down
your explanations in more than one way.
b) how would you explain the concept \electric current" through a conduct-
ing material, say, a wire?

c)explain the concepts of resistance and conductance.
d) is the resistance of a conducting material constant? or does it change
under di erent conditions? what are the conditions with which the resis-
tance of a conductor varies?
3. explain the concepts of resistance and conductance.

What precautions should you take to prevent injuries when dealing with heavy loads?

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody