An electrical appliance has a rating 100 W, 120 V. the resistance of element of appliance when in use is:
An electrical appliance has a rating 100 W, 120 V. the resistance of element of appliance when in use is:
(a) 1.2Ω (b) 144 Ω (c) 120 Ω (d) 100 Ω
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144Ω
Solution:
Given, power (p) = 100 w
Potential difference, v = 120 volt
∴ Resistance, r = (v)2/P = (120)2/100 = 144 Ω
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