Instructions: complete the Quiz. 20 points for each problem 1. The ends of a wir

Question

Instructions: complete the Quiz. 20 points for each problem 1. The ends of a wire are connected to the teminals of a hatery, and a eent/is how circuit. For which of the following changes will result an increase of ewmew Cheek eff that apel lal Replace the wire with one that has a larger resistivity Ibl Replace the wire with one that has a langer cross section Iel Replace the wire with a longer one. Id] Replace the wire with one that has a smaller resistivity lel Replace the wire with one that has a smaller cross section I1 Replace the wire with a shorter one 2. Some light bulbs are connected in parallel to a 120 V source as shown in the igureE dissipates an average power of 60 W. The cicuit has a fuse F that bums out when the cre circuit exceeds 9 A. (a) Determine the maximum number of builbs, which can be used in this erewi without burning out the fuse: (b) determine the current that flows through each of the light bus and what is the resistance of a single light bulb? 1xo V resistance) and a battery iv. 3 von as shy 3. Consider the circuit with three resistors (each has 10 in figure. (a) Which two resistors are wired in parallel? (b) What is the equivalent resistance of these two? R. R, (c) What is the total resistance? (d) What is the total current?

Explanation / Answer

1.

Answers are b,d and f

Resistance of a wire is given by

R=pL/A

where p=resistivity of wire

L=Length of wire

A=Area of crosssection of wire

Current flowing through the wire is given by

I=V/R =V/(pL/A)

I=VA/pL

a)Larger resistivity means Lesser current since Current is inversly proportional to resistivity of the wire

b)Larger area of cross section means larger current since current is directly is proportional to area of cross section

c)Increased length means lesser current since Current is inversly proportional to length of wire

d)smaller resistivity means larger current since same reason as a

e)smaller crosssection of area means lesser current since same reason as b

f)Lesser length means larger current since same reason as c

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