Determine the Constant of Variation for the Stated Condition

question 482

Multiple Choice

Determine the constant of variation for the stated condition.
-The power that a resistor must dissipate is jointly proportional to the square of the current flowing through the resistor and the resistance of the resistor. If a resistor needs to dissipate 28 watts of power when 2 amperes of current is flowing through the resistor whose resistance is 7 ohms, find the power that a resistor needs to dissipate when 3 amperes of current are flowing through a resistor whose resistance is 7 ohms.

• A) 63 watts
• B) 21 watts
• C) 147 watts
• D) 42 watts

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