Question

In comparing wires of identical shape and carrying the same current but made of different metals, is the drift velocity in each wire inversely proportional to the number density of charge carriers?

No. The drift velocity is the same for all conductors.

Yes. To have the same current from k times as many carriers, it takes k times the drift speed.

No. The drift velocity is directly proportional to the number density of carriers.

Yes. To have the same current from k times as many carriers, it takes 1/k times the drift speed.

The amount of charge that passes through a filament of a certain lightbulb in 1.98 s is 1.52 C.

(a) Find the current in the bulb.
A

(b) Find the number of electrons that pass through the filament in 5.39 s.
electrons

(c) If the current is supplied by a 12.0-V battery, what total energy is delivered to the lightbulb filament?
J

What is the average power?
W

A 9.00-V battery delivers a current of 1.30 A to the lightbulb filament of a pocket flashlight.

(a) How much charge passes through the filament in 1.40 min?
C

(b) How many electrons pass through the filament?
electrons

(c) Calculate the energy delivered to the filament during that time.
J

(d) Calculate the power delivered by the battery.
W

Answer 1

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c) Total ensay debhesch d) Aveoe uu a) Cussent in the bullb is, 1.98 b No edetts-ans pasesed tn 5.34s -19 As Dne eletsun Contatn .bxo Chage, -19 c) Totalenext deed to the Hlamat s, E- 1vt (oH) (12) (-98) = lg.qq5 J P- 1v - (o.ta) (k) - 9:24 wabts