ELEC 211 Lecture Notes - Lecture 14: Kilowatt Hour, Ohmmeter, Resistor
Document Summary
Energy, w, is the ability to do work and is measured in joules. One joule is the work done when a force of one newton is applied through a distance of one meter. The symbol for energy, w, represents work, but should not be confused with the unit for power, the watt, w. The kilowatt-hour (kwh) is a much larger unit of energy than the joule. There are 3. 6 x 106 j in a kwh. What is the energy used in operating a. Power is the rate energy is used (actually converted to heat or another form). Three equations for power in circuits that are collectively known as watt"s law are: Resistor failures are unusual except when they have been subjected to excessive heat. Look for discoloration (sometimes the color bands appear burned). Test with an ohmmeter by disconnecting one end from the circuit to isolate it and verify the resistance.
