AT&T; 11:03 PM a session.masteringphysics.com C Exercise 25.41 MasteringPhysics

Question

AT&T; 11:03 PM a session.masteringphysics.com C Exercise 25.41 MasteringPhysics Constants e the standard voltage in homes is 220 V instead of the uropean In Europ 120 V used in the United States. Therefore a "100-W" E bulb would be intended for use with a 220-V potential difference. Part A If you bring a 100.W States, what should be its U.S. power rating? European bulb home to the United Submit Request Answer Part B How much current will the 100-W Eu normal use in the United States ropean bulb draw in Submit Request Answer Next

Explanation / Answer

(a)

the equaton for power in europe is

P_E = V_E^2/R

in US

P_US = V_US^2/R

P_US /P_E = V_US^2/V_E^2

P_US= 120^2/220^2 * 100

=29.75 W

(b)

P_Us= V_US I

I = 29.75/120 = 0.2479 A

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