The power, in watts, dissipated as heat in a resistor varies directly with the square of the voltage and inversely with the resistance. If 70 volts are placed across a 70-ohm resistor, it will dissipate 70 watts. What voltage across a 10-ohm resistor will dissipate 250 watts?
?
A. 
B. ?
C. ?
D. ?
E. ?
Answer: A
Mathematics
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