Question 1: A total charge of 6.5 mC passes through a cross-sectional area of a

Question

Question 1: A total charge of 6.5 mC passes through a cross-sectional area of a nichrome wire in 2.8 s. What is the current in the wire? The fundamental charge is 1.602 × 1019 C. Answer in units of A.

Part 2: How many electrons pass through the crosssectional area in 24.0 s?

Part: If the number of charges that pass through the cross-sectional area during the given time interval doubles, what is the resulting current? Answer in units of A.

Q2 In a circuit of two lamps in parallel there is 6 V across one lamp. What is the voltage across the other lamp? Answer in units of V.

Q3 How long does it take a total charge of 13.0 C to pass through a cross-sectional area of a copper wire that carries a current of 3.5 A? Answer in units of s.

Explanation / Answer

1)

a) total charge , Q = 6.5 mC

time taken, t = 2.8 s

current in the wire = Q/t

current in the wire = 6.5/2.8

current in the wire = 2.32 mA

the current in the wire is 2.32 mA

b)

number of electrons passing in 24 s = charge passed/charge on each electron

number of electrons passing in 24 s = 2.32 *10^-3 * 24/(1.602 *10^-19)

number of electrons passing in 24 s = 3.48 *10^17

the number of electrons passing in 24 s is 3.48 *10^17

c)

If the number of charges doubles , the current will also double

new current = 2 * 2.32 = 4.64 mA

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