1. A generator having an emf of 180 V delivers 1200 W to a 16 ohm heater. Determine the

a) current through the heater.

b) power generated by the emf

c) power lost in the generator

d) Internal resistance of the generator

2. Plot resistivity versus temperature for the following materials:

a) conductor

b) semi-conductor

c) superconductor

Explain the behavior of resistivity versus temperature for a (half a page)

d) conductor in terms of the wave nature of the electron

e) pure semi-conductor in terms of the valence and conduction energy bands.

**no plagiarism please

**use simple words

**I need to see the calculations