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A 400 W electrical device is designed to work in 100 V. What will be its power if the device is working in 100 V? |
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Answer» Resistance of the appliance R = \(\left(\frac{ V^2 }{P}\right)\) = \(\cfrac{100 \times 100}{400}\) = 25 Ω Power when connected in 100 V P = \(\left(\frac{ V^2 }{R}\right)\) = \(\cfrac{100 \times 100}{25}\) = 400 Ω |
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