Constants Periodic Table Part A Eight bulbs are connected in parallel to a 110 V

Question

Constants Periodic Table Part A Eight bulbs are connected in parallel to a 110 V source by two long leads of total resistance 1.6 If 220 mA flows through each bulb, what is the resistance of each? Express your answer using two significant figures R-1.8 10 Submit revious Answers Request Answer X Incorrect: Try Again; 3 attempts remaining Part B f 220 mA flows through each bulb, what fraction of the total power is wasted in the leads? Express your answer using two significant figures. fraction wasted Submit Request Answer

Explanation / Answer

(A) if 220 mA flows throug each bulb then

current through lead = 8 x 220 mA = 1760 mA

I = 1.76 A  

PD across lead = 1.76 x 1.6 = 2.816 Volt

V_bulb = 110 - 2.816 = 107.2 Volt

R = V / I

R = 107.2 / (0.220) = 490 ohm

(B) P_total = (1.76 x 110) = 193.6 W

P_wasted = 1.76^2 x 1.6 = 4.96 W  

fraction = 4.96 / 193.6

= 0.0256

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