The power supplied to a typical black-and-white television set is86 W when the s

Question

The power supplied to a typical black-and-white television set is86 W when the set is connected to 120 V. (a) How much electrical energy does this setconsume in 1 hour?
_____________ J
(b) A color television set draws about 2.7A when connected to 120 V. How much time is required for it toconsume the same energy as the black-and-white model consumes in 1hour?
_____________ min (a) How much electrical energy does this setconsume in 1 hour?
_____________ J
(b) A color television set draws about 2.7A when connected to 120 V. How much time is required for it toconsume the same energy as the black-and-white model consumes in 1hour?
_____________ min

Explanation / Answer

   a.   Energy   E   =   Power* time          E   =   86* 3600      =   3.096*105   J   ˜   3.1* 105   J    b.   Power rating of colourTV          PC   =   V* I   =   120 *2.7   =   324   W          Time   t   =   energy/ power   =   3.096 * 105/324   =   955.56   s          t   =   955.56 /60   =   15.93   min.

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