In the figure, what is the current supplied by the emf when the frequency is very small? Assume that R1 = 100 N and R2 = 40 2 .(Figure 1) Express your answer to two significant figures and include the appropriate units. 圖] ? Irms = Value A Figure 1 of 1 Part B What is the current supplied by the emf when the frequency is very large? Express your answer to two significant figures and include the appropriate units. R, R 10 V rms HA 50 mH :20 µF Irms = Value A

temperature rating that a conductor must have and still have 69 Ambient Tempere 4. The ampacity of 15 current-carrying 10 RHW aluminum conduc- tors in a raceway in an ambient temperature of 75'F is 1. gon factor for conductor ampacity in this location is (a) 12A (b) 15A (c) 22A (d) 30A 0.71 b0.82 0.88 0.96 5. Ain) uous load if the ambient temperature is 75°F and there are nine THHN conductor is required for a 19.70A noncontin- ne ambient temperature is 71"C, the minimum insulation current-carrying conductors in the raceway in a dry location. he capacity to carry current is (a) 14 (b) 12 (c) 10 A 60°C AI 90°C 105°C (d) 8 0 120°C 6. 6.11 Ampacity Adjustment [310.15(B)(3)(a)] The ampacity for each of nine current-carrying 10 THW conduc- tors installed in a 20 in. long raceway is 1 The ampacity of six current-carrying 4/0 XHHW aluminum con- ductors installed in a ground floor slab (wet location) is (a) 25A (b) 30A (c) 35A (d) 40A a) 135A 0) 144A (e) 185A 4 210A

The diameter of an ACSR conductor is 1.1116 inches. The steel core has strands of diameters of 0.1291 inches each. If 54 Aluminum strands have the diameters of 0.1351 inches each, the number of Steel strands is: O A. 15 O B. None of choices are correct O C. 19 O D.7 O E. 27