What resistance must be connected in series with a heater


At what temperature does the resistance of a nickel rod increase to 5 of the rod's resistance at 20C degree?

2) What resistance must be connected in series with a heater rated at 150mA with hot resistance of 320 ohm in order to operate it safely from a 117-V source? What power rating must this resistor have?

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Electrical Engineering: What resistance must be connected in series with a heater
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