P202_Ch211_HWa

# P202_Ch211_HWa - P202 spring 2006 Chapter 21 Electric...

This preview shows pages 1–2. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

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?...
View Full Document

{[ snackBarMessage ]}

### Page1 / 6

P202_Ch211_HWa - P202 spring 2006 Chapter 21 Electric...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online