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A manufacturer of carbon-film resistors specifies a maximum working voltage of 250 V for all its -W resistors. Exceeding 250 V causes internal arcing within

A manufacturer of carbon-film resistors specifies a maximum working voltage of 250 V for all its ¼-W resistors. Exceeding 250 V causes internal arcing within the resistor. Above what minimum resistance will the maximum working voltage be exceeded before its ¼-W power dissipation rating is exceeded? Hint: The maximum voltage that produces the rated power dissipation can be calculated as 

 

V = VPX R max

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