A worker is standing on a wet concrete floor, holding an electric drill having a metallic case. The metallic case is connected through the ground wire of a three-terminal power outlet to power-system ground. The resistance of the ground wire is Rg. The resistance of the workers body is Rw = 500 . Due to faulty insulation in the drill, a current of 2 A flows into its metallic case. The circuit diagram for this situation is shown in Figure P2.44. Find the maximum value of Rg so that the current through the worker does not exceed 0.1 mA. Rw = 500 Rg + v i = 2 A Concrete floor Power-system ground Metallic case Figure P2.44
Instruction for “Makefile” the Makefile tells make how to compile and link a program. Using C/C++ as an example, when a C/C++ source file is changed, it must be recompiled. If a header file has changed, each C/C++ source file that includes the header file must be recompiled to be safe. Each compilation produces an object file corresponding to the source file. Finally, if any source file has been recompiled, all the object files, whether newly made or saved from previous compilations, must be linked together to produce the new executable program. These instructions with their dependencies are specified in a Makefile. If none of the files that are prerequisites have been changed since the last time the program was compiled, no actions take place. For large software projects, usi
