A coil develops heat of 800 cal/sec. When 20 volts is applied across its ends. The resistance of
the coil is
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Heat = 800 cal/s = 3347.2 J/s
V = 20V
H = (V²/R)×t
⇒3347.2 = (20²/R)×1
⇒R = 400/3347.2 = 0.12 ohm
V = 20V
H = (V²/R)×t
⇒3347.2 = (20²/R)×1
⇒R = 400/3347.2 = 0.12 ohm
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