Question

- A circuit with an equivalent resistance of 5.0 uses 125 J of energy each second. What voltage is used to power this circuit? a) 5 V b) 15 V c) 25 V d) 45 V e) 625 V Two cylindrical resistors, A and B, are made from two different materials and have the same resistance. Resistor A has a conductivity of A = 10 03. The resistors are manufactured with the same length. The radius of Resistor A (A) must be: a) 0.01 r b) 0.17 c) TB d) 10 B e) 100 rp A string of holiday lights contains 100 light bulbs. When a light bulb "burns out," the resistive filament that normally heats up and generates light melts and breaks. If the 100 light bulbs are wired in series, then when one light bulb burns out _, or if they're wired in parallel a) the other 99 bulbs will turn off the other 99 bulbs will turn off b) the other 99 bulbs will remain on the other 99 bulbs will turn off c) the other 99 bulbs will turn off the other 99 bulbs will remain on d) the other 99 bulbs will remain on the other 99 bulbs will remain on Kirchhoff's Junction Rule may be used in circuit analysis, because: a) Energy cannot be created or destroyed b) Charge cannot be created or destroyed c) Linear momentum cannot be created or destroyed d) Angular momentum cannot be created or destroyed

Answer 1

1.) R = 52 E = 125J/s Recall P = 1² 125 - R 5 so V = 5725*5 = 251 Ans © 25V Ans. 2.) A RA = RB A = 100B عا Recoll RA= 2 RB = OB ar? RA= RB LA Saara LA to OA ATA Bar 10 % ra² = foro on r² = are? A = Ye JTO -0.31678 3.) when connected in series and one connected in parallel bulb burns rest og will furn off bulb burns rest gg will remain on when and one So © is correct 4.) Kirchoff's junction law is based on conservation of charge. D is correct answer