1.

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?

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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