A 15m long copper wire has a cross-sectional radius of 3mm. (a) What is the resistance of the wire? (b) If 200mA of current flows through the wire, what is the voltage drop of the wire at 20°C? (c) What is the voltage drop per meter at 20°C

A metallic wire is stretched from original length of 3 m to 6 m. If the original cross-sectional area is 4 mm? and original resistance is 6 N, determine the new resistance of the metallic wire.

A 75-cm-long heating wire is connected to a 120 V outlet. If the wire dissipates 50W, what are (a) the current in and (b) the resistance of the wire?

If we have a material with the same electrical properties in all directions, we define its resistivity p (the Greek letter "rho") as the ratio of the magnitudes of the electric field E and the current density J: 0= In vector form, The SI unit of resistivity is one-ohm meter (1 Q-m, where the Greek letter "omega" stands for "ohm"). One ohm equals one volt per ampere (1 0 = 1 VIA). For many materials and devices, Georg Simon Ohm found that J is directly proportional to E at a given temperature. If so, p is constant and we say that the material or device follows Ohm's Law or that it is ohmic. е Calculate the resistivity of a certain metal if an electric field of 7.2 x 10-3 V/m gives a current density of 1.20 x 105 A/m2 he 6.0 x 10-8 ohm-m 7.2 103 ohm-m ware O 1.2 x 105 ohm-m izo. 0.17 x 102 ohm-m icrosoft Teams Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save and Subm