An application with useful tables and calculators for electricians and electronics. You will find in it calculators ie Ohm's Law calculator equivalent (parallel and serial) resistance resistor selection for the LED diode or you can calculate how much you save by replacing the traditional bulb with an LED bulb. The application also includes tables such as electrical symbols logic gates wire markings units resistivity radio waves multiples IP scale antenna settings fuse colors and resistor colors. The final element of the application is a theory that may prove useful during learning.