hed 9-16-2019.ltd tal (F) Min. reading Name: PHYSICS 1112 - Warm-Up due September 16th Chapter 20 Reading Objectives: take away. You may want to work examples 20.1 and 20.2. Current is "conserved" meaning that at any junction of wires, the amount of "flow" going in must be the same as the amount of "flow" going out. Later on, we will call this Kirchhoff junction law In section 20.2 you will find the definition of resistance and its units. Also Ohm's law. Ohm's law is one of the main principles in electronics. You will use equation 20.14 many times in the following weeks. Go to section 20.1 and read the definition of current. Pay attention to the units. Equation 20.1 is a main 1. An electric eel flexes its muscles to create a voltage that stuns its prey. During the discharge, the eel can transfer a charge of 2.0 mC in a time of 2.0 ms. What current, in A, does this correspond to? Warm-up 2. The wires below carry currents as noted. What are I1 and I2? I2 2 A I1 3 A 4A

Raura aloruo. UCF PHY2054 Post Lab-Unit 06 Kirchhoff's Laws -6V + 1. in che picture on the right, what is the current in the wire above the junction? Does charge flenw toward or away from the junction? 10 V

tus or W tus (15%) Problem 1: Consider a wire made of copper with conductivity 6.0 x 107 02¹m¹, which has a circular cross-section of radius 0.17 mm. In a particular circuit, this wire carries a current of 2.5 A. Fequiere, Vanessa-vanessa fequiere@uconn.edu Completed Completed @theexpectta.com-Arackmg 10:2ZEN BALIMISTADA so may result in terminaisou your Expen TNI A 50% Part (a) What is the electric field, in volts per meter, inside this wire? E=1 sin() cotan() atan() cosh() cos() asin() acotan() tanh() Degrees Submit tan() acos() sinh() cotanh() Radians Hint E ( + VO Feedback 7 8 9 4 5 6 1 2 3 131 0 I give up! Feedback: 0% deduction per feedback. olanens sharing website is strictly forbidden. Doing Grade Summary Deductions Potential 0% 100% Submissions Attempts remaining: S (0% per attempt) detailed view Hints: 2% deduction per hint. Hints remaining: 1 50% Part (b) If we replace this wire with a gold one of the same size, with conductivity 4.1 x 1072 m, what will the electric field in…

6) In recent class lectures, we discussed the temperature dependence of the electrical resistivity, p(T) for the three main classes of materials that conduct an electrical current; conductors, semiconductors, and superconductors. In the graph below, draw in by hand examples of the temperature dependence of the electrical resistivity, pT), for each material type. Give at least one example of each material type. plT) + +>T(K) 100 200 300