Which type of biasing gives a semiconductros diode vary high resistance?

How does the resistivity of a conductor and a semiconductor vary with temperature? Give reason for each case.

The circuit shown in the figure contains two diodes each with a forward resistance of 30 Omega and with infinite backward resistance. If the battery is 3 V, the current through the 100 Omega resistance (in ampere)

How does resistivity of semiconductor vary with temperature? Give reason for each case?

How does resistivity of conductor vary with temperature?

A low voltage supply from which one needs high currents must have very low internal resistance. Why?

Why the fuse wire should have high resistance and low melting point?

What the help of a diagram, show that biasing of a light emitting diode (LED). Give its two advantages over conventional incandescent lamps.