110425-opp - 4/25/11 Physics 122 1 4/25/11 Physics 122 2...

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Unformatted text preview: 4/25/11 Physics 122 1 4/25/11 Physics 122 2 4/25/11 Physics 122 3 Answer: 1 in 30 billion 4/25/11 Physics 122 4 4/25/11 Physics 122 7 Δq I= Δt ma = Fe − bv a=0 ⇒ v= Fe Fe = qE E ΔV = − L 4/25/11 Physics 122 8 b I I = qnAv ⇒ v = qnA qE = bv ΔV ΔV = EL ⇒ E = L qΔV bI ⇒ = L qnA ΔV = IR 4/25/11 Physics 122 ⎛ bL ⎞ ΔV = I ⎜ 2 ⎟ ≡ IR ⎝ q nA ⎠ 9 ⎛ bL ⎞ L 1L R=⎜ 2 ⎟ =ρ = ⎝ q nA ⎠ A gA 4/25/11 Physics 122 10 ΔW P = rate of doing work (using energy) = Δt = (number of charges moved) × (force) × (distance moved in a time Δt ) (nAL )(qE )(vΔt ) ΔV P= = (nAL )qv = (qnAv)ΔV = I ΔV Δt L 4/25/11 Physics 122 11 P = I ΔV 4/25/11 Physics 122 12 4/25/11 Physics 122 13 4/25/11 Physics 122 14 No resistance constant v even without gravity No resistance constant v even without gravity 4/25/11 Resistance constant v even with gravity (mg=bv Physics 122 ) 15 4/25/11 Physics 122 16 4/25/11 Physics 122 17 4/25/11 Physics 122 18 4/25/11 Physics 122 19 pump and storage bin (battery) sluices (wires) water wheel (bulb) 4/25/11 Physics 122 20 4/25/11 Physics 122 21 4/25/11 Physics 122 22 ΔV = IR 4/25/11 Physics 122 23 ΔV = IR 4/25/11 Physics 122 24 4/25/11 Physics 122 26 ΔV = ΔVA + ΔVB IReff = IRA + IRB A Reff = RA + RB B I = IA + IB ΔV ΔV ΔV = + Reff RA RB 1 1 1 = + Reff RA RB 4/25/11 Physics 122 A B 27 ...
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110425-opp - 4/25/11 Physics 122 1 4/25/11 Physics 122 2...

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