Exercise 1

Hoe much would you have to raise the temperature of a copper wire (originally at 20 degrees Celsius) to increase it's resistance by 18%? Assume the temperature coefficient of resistivity of copper is 0.0039 (degrees Celsius )^-1. Answer using two significant figures.

Exercise 2

A service station charges a battery using a current of 6.2A for 6.0 h. How much charge passes through the battery? Answer using two significant figures. Delta Q= ? C

Exercise 3

Suppose a current is given by the equation I=1.60sin(170t), where I is is amperes and t is in seconds.

1-What is frequency? (answer in three significant figures)

2-What is the rms value of the current? ( answer in three significant figures)

3-