electricity

Electricity I=current, and is measured in Amps. R=resistance, and is measured in Ohms. P=power, and is measured in watts. E=energy, and is measured in volts. 1 hosepower is equal to 746 watts Cost for electricity is based on a kilowatt hour. A voltmeter is always placed in parallel to the lines of a circut. In a series voltage is seperated at each outlet. Voltage acts like a force, because it moves electrons through a circut. AC current changes direction 60 times per. second. The normal Voltage supplied in homes is 220. DC power can only be stepped down. AC power could be either stepped up, or stepped down. An ammeter is hooked up in a series. Electrical formulas. P E|I E=IxR find volts P=ExI find watts R=E/I find ohms I=P/E find amps *Example problem* I have a 5hp motor wired at 220V, 3 ohms. How many amps does it draw and what size wire do I need to run it? 5hpx746watts=3730watts formula:P/E=I 3730/220=16.95 amps #12 wire(refer to wire size chart below.) Wire Size Chart 15 amps=#14 wire 20 amps=#12 wire 30 amps=#10 wire 40 amps=#8 wire 50 amps=#6 wire 60 amps=#4 wire 70 amps=#2 wire *note-If wiring in an appliance with a heating element, drop down one wire size. Ex. if amerage draw requires a #8 wire drop to a #6 wire. *Example problem.* What size wire do I need for a stove\oven with 4 top burners @600watts ea., the top heat. element @2600watts, and the bot. heat. element @2000watts? (220V) 2600+2000+2400=7000watts 7000/220=31.81amps=32amps(round to whole number) #8 wire, but you are using a heating elemant, so drop to a #6 wire.