P202_Ch211_HWa

P202_Ch211_HWa - P202 spring 2006 Chapter 21 Electric...

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Unformatted text preview: P202 spring 2006 Chapter 21: Electric Current and Direct-Current Circuits Homework due exactly at 11:59pm Jan. 29, 2006. All answer tolerance within 3% 1. A television set is connected to a 120-V outlet consume P=[85]W of power. (a) How much current flows through the television? ? __________ A (b) How long does it take for 10 million electrons to pass through the TV? _____×10-12 s. Solution: (a) A V W V P I VI P 708 . 120 85 , = = = = (b) ( ) s A C I Q t t Q I 12 19 6 10 26 . 2 708 . 10 6 . 1 ) 10 10 ( , − − × = × × × = ∆ = ∆ ∆ ∆ = 2. A current of 0.76 A flows through a copper wire d=[0.44] mm in diameter when it is connected to a battery of 15V. How long is the wire? (The resistivity of copper is 1.72×10-8 Ω⋅ m.) Length of the wire: ____________ m. Solution: m L m L m A L R A V I V R IR V 174 74 . 19 ) 10 44 . ( 4 1 ) 10 72 . 1 ( 74 . 19 76 . 15 , 2 3 8 = Ω = × Ω × = = Ω = = = = − − π ρ 3. Consider a rectangular block of silicon of height A =[1] cm, width B=[2] cm, and length C=[5]cm, (The resistivity of silicon = 60 Ω⋅ m ) (a) If a potential difference V=10 Volts is maintained between the two AxB faces of the block, how much current is flowing out of the battery? ______ faces of the block, how much current is flowing out of the battery?...
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P202_Ch211_HWa - P202 spring 2006 Chapter 21 Electric...

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