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Samurai Hoghead
Lv 7
Samurai Hoghead asked in Science & MathematicsEngineering · 5 years ago

I'm a little rusty and need a short answer?

I am a railroad modeler and am going to install a decoder in a locomotive for DCC operation.

The manufacturer of the decoder says to build a test track to make sure any mistake in wiring won't create damage by installing a 27 ohm resistor to limit current.

The manufacturer of the DCC unit employed for control came with a test track device, pre-built, incorporating a 120 ohm/ 2watt resistor. If memory serves, that 120 ohm voltage attenuation is more than the 27 ohm, so it should be safe.

Am I right?

Thanks in advance for the input...

2 Answers

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  • spot a
    Lv 7
    5 years ago
    Favorite Answer

    You are right. Current is limited to a much smaller amount by the 120 ohm resistor

  • Rob
    Lv 5
    5 years ago

    get a shower and use soap.. rust all gone

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