2072

Physics Current Electricity Level: High School

Consider a circuit with three identical bulbs , an ideal battery , and a switch S . Assume the resistance of each light bulb remains constant . Leaving S open,

(a) compare i0, i1 and i2 .

(i) i0 < i2 < i1

(ii) i1 > i0 = i2

(iii) i0 = i1 = i2

(b) Now we close S . Denote the open switch circuit quantities as unprimed , and the closed switch circuit quantities as primed . Determine i’1/i1.

(i) i’1/i1 = 2

(ii) i’1/i1 = 5/3

(iii)i’1/i1 = 4/3

(iv)i’1/i1 = 1/3

(c) Determine i’2/i2

(i) i’2/i2 = 1/ 2

(ii) i’2/i2 = 1

(iii) i’2/i2 = 5/3

(iv) i’2/i2 = 1/6