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An automobile has a 12-W reading lamp in the ceiling. This lamp operates with a voltage drop of 12 V across it

Suki (sue-key) , Sunday, 15th of August 2010 06:42:28 AM

An automobile has a 12-W reading lamp in the ceiling. This lamp operates 
Suki (sue-key)
with a voltage drop of 12 V across it. How much current flows through the 
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lamp? Round the answer to 3 significant digits.
 
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Honey Bear , Monday, 16th of August 2010 07:42:24 AM

wattage = voltage x curent  
Honey Bear
12 = 12 x I  
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I = 1 amp  
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PS, the normal battery voltage is 14 volts when the battery is being  
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charged, which it is when the engine is on.  
 
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