2. [0/1 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYS2016 23.7.WA.031. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) What is the voltage output of a transformer used for rechargeable flashlight batteries if its primary has 479 turns, its secondary has 8 turns, and the input voltage is 125 V? 20.07 X How are the number of turns in the secondary and primary coils related to the input and output voltages? V (b) What input current is required to produce a 4.00 A output? 0.0664 1X How are the voltages in the secondary and primary coils related to the input and output currents? mA (c) What is the power input? 03 X How is power defined in terms of voltage and current? W Additional Materials Reading3. [0.67/1 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYS2016 23.7.WA.032. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage to 422 kV. The secondary of this transformer is being replaced so that its output can be 519 kV for more efficient cross-country transmission on upgraded transmission lines. (a) What is the ratio of turns in the new secondary to turns in the old secondary? Ns, new = 1.229 Ns, old (b) What is the ratio of new current output to old output (at 422 kV) for the same power? Is, new = 0.01 Is, old X How are the voltages in the secondary and primary coils related to the input and output currents? (c) If the upgraded transmission lines have the same resistance, what is the ratio of new line power loss to old? Pnew = 0.65 Pold Additional Materials Reading6. [0.5/1 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYS2016 23.12.WA.059. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A 9.10 JF capacitor and a 3.80 mH inductor are connected in series with an AC power source that has a frequency of 1.20 x 10 Hz and a peak voltage of 58.0 V. Take the initial time t as zero when the instantaneous voltage equals zero. (a) What is the instantaneous voltage at t = 1.64 x 10-4 s? 54.52 V V (b) Determine the instantaneous current when t = 1.64 x 10-4 s. 3.91 X What is the phase angle between the instantaneous current and instantaneous voltage in an RLC circuit where R = 0? How does this affect the expression for the instantaneous current? A Additional Materials Reading