Posted by Betty on .
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The maximum number of volts, E, that can be placed across a resistor is given by the formula E=sq root(PR), where P is the number of watts of piwer that the resistor can absorb and R is the resistance of the resistor in ohms. Solve this equation for R. Use the result to determine the resistance of a resistor if P is 1/2 watts and E is 60 volts.

Algebra 
Steve,
E = √PR
E^{2} = PR
R = E^{2}/P
R = 3600/0.5 = 7200 ohms