Solve.For a resistor in a direct current circuit that does not vary its resistance, the power that a resistor must dissipate is directly proportional to the square of the voltage across the resistor. The resistor must dissipate 
watt of power when the voltage across the resistor is 7 volts. Find the power that the resistor must dissipate when the voltage across it is 21 volts.
A. 
watt
B. 
watt
C. 
watt
D. 
watts
Answer: C
Mathematics
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A. 
B. 
C. 3
D. 
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, 
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A. 
B. 
C. 
D. 
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