# 1 - ECTE172 Introduction to Circuits and Devices Spring...

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ECTE172 Introduction to Circuits and Devices Spring 2007 Tutorial 1 1. (2-16) If 21 . 847 X 10 18 electrons pass through a wire in 12 s, what is the current? 2. (2-22) Charge is ﬂowing through a conductor at the rate of 420 C/min. If 742 J of electrical energy is converted to heat in 30 s, what is the potential drop across the conductor? 3. (2-23) The potential diﬀerence between two points in an electric circuit is 24 V. If 0.4 J of energy were dissipated in a period of 5 ms, what would the current be between the two points? 4. Name several examples of primary and secondary cells. 5. On an average bright sunny day how many watts will be available (in electrical form) per cm 2 of a solar cell? What would be the conversion eﬃciency of a solar cell? 6. Comment on the availability of free electrons in an insulator compared to that of a good conductor. 7. Compare the conductivity of Copper and Aluminium. Give some reasons as to why power line conductors are made of Aluminium. 8. If you want to measure the current drawn by a piece of equipment and the voltage
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## This note was uploaded on 08/20/2010 for the course ECTE 722E taught by Professor Xxx during the Three '08 term at University of Wollongong, Australia.

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