Question

1. What is meant by an electric current? How is current defined? What is the SI unit for current,and how does it relate to other SI units? What is resistance?

What is resistivity? How arethe two related? What are the units on resistance and resistivity? What is meant by the temperature coefficient of resistivity? What is Ohm's law? For what situations does it apply?Explain why V = IR is not really a correct statement of Ohm's Law. What is a resistor?What exactly is meant by “the voltage drop across a resistor?" How does one calculate the voltage drop across a resistor, given the current passing through it?

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