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The electric current I in a circuit varies directly as the voltage V. When 21V are applied, the current is 4A. What is the current when 18 volts are applied

  • Math -

    i = k V
    4 = k (21)
    k = 4/21

    i = (4/21) 18 = 4*6/7 = 24/7 = 3.43 amps

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