A \( 500 \mathrm{~W} \) heating unit is designed to operate from a 115 volt line. If the line vo...

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A \( 500 \mathrm{~W} \) heating unit is designed to operate from a 115 volt line. If the line voltage drops to 110 volt, the percentage drop in heat output will be
(a) \( 10.20 \% \)
(b) \( 4.1 \% \)
(c) \( 8.5 \% \)
(d) \( 7.6 \% \)
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