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    rpdecomp's Avatar
    rpdecomp Posts: 1, Reputation: 1
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    #1

    Aug 19, 2009, 09:16 AM
    Heating element resistance
    I have an AO SMITH water heater model EJCT 20 (compact type), when checking for continuity I use a DMM and on the resistance section I see 2000k, 200k, 20k, 2000, and 200... which setting should I use to test a 120v 1500w heating element and what would my reading be if good and what if bad... also, does it matter which post the wires reconnect to? Thanks
    eeseely's Avatar
    eeseely Posts: 100, Reputation: 3
    Junior Member
    		  
    #2

    Aug 19, 2009, 10:37 AM

    Given: You have a 120 Volts and a 1500 watt heating element.

    V^2/R = 1500 watts

    Thus, R = V^2/1500

    14400/1500 = 9.6 ohms

    Use the 0-200 ohm
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