and the direction of thehae wire in 10.0 min? Sketch the direction of the curren

Question

and the direction of thehae wire in 10.0 min? Sketch the direction of the current and the direction of the electrons' motion 26. If a current of s0.0 mA exists in a metal wire, how many electrons flow past a . 3.0x 1o b. 4.50 x 10 c.7.50 x 10 d. 9.50 x 102 27. A 1. 00-V potential difference is maintained across a 10.0-0 resistor for a of 20.0 s. What total charge passes through the wire in this time interval? a. 1.05 mA b. 1.05 A period c.5.05 mA d. 1.05 nA 28 A lightbulb has a resistance of 240 when operating at a voltage of 120V. What is the current in the bulb? a. 0.50 A b. 0.90 A C. 0.44 A d. 0.34 A 29. A wire with resistance of 30.0 Ohm in a 3.2-m length of wire with a uniform radius of 0.40 cm. What is the resistivity of the wire? a. 4.7 x 10 Ohm.cm

Explanation / Answer

26. given i = 80 mA

t =10 min

number of electrons, n = i*t/e = 80*10^-3*10*60/1.6*10^-19

n = 30*10^19

option a.

27. V = 1 V

R = 10 ohm

t = 20 s

q = (V/R)*t = 2 C

i = 0.1 A

28. R = 240 ohms

V = 120 V

from ohms law

i = V/R = 0.5 A

option a.

29. R = 30 ohm

l = 3.2 m

r = 0.4 cm

rho = R*A/l = 4.712*10^-4 ohm m = 4.712*10^-2 ohm cm

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