What are electocardiagrams?

What is electrical stress? How might knowing about the inputs and outputs and side effects or errors produced within a system or device help you fix the device? What is a stab in an electrical panel? Why 3 phase is 440 volts why not 660? How much is 200 watts in degrees? What is dielectric absorption rate? Difference between clipper and clamper circuit? What is the working principle of prefix operators? Define the term critical field resistance? How do windmills store electricity? What size conduit do I need for 6 wire. Being hooked up to a spa? Can you supply three 220 -240 volt 16.6 amp infrared heaters with one circuit? How do you calculated the current shunt? What protection must be provided when installing a cable in a notched stud or joist? How many 3-to-8 line decoders with an enable input are needed to construct a 6-64? What is the principle of digital multimeter? What is the difference between voltage drop and power loss? What minimum size-grounding conductor is required if the circuit protection ahead is rated at 500 amps instantaneous? How many low voltage 20w lights can you connect to a 10Va transformer? How do you add an outlet to a porch light?