Transformers: Consider an ideal step-down transformer that converts 120 VAC (wall-socket voltage) to 15 VAC with no losses. Both voltages are rms values. 120 VAC 15 VAC a) What is the ratio of number of turns on secondary to primary (N/Np)? b) What is the amplitude of the secondary voltage? c) What is the peak-to-peak voltage on the secondary?

Transformers: Consider an ideal step-down transformer that converts 120 VAC (wall-socket voltage) to 15 VAC with no losses. Both voltages are rms values. 120 VAC 15 VAC a) What is the ratio of number of turns on secondary to primary (N/Np)? b) What is the amplitude of the secondary voltage? c) What is the peak-to-peak voltage on the secondary?

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.21P: An industrial plant consisting primarily of induction motor loads absorbs 500 kW at 0.6 power factor...

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A Step-Down Transformer. A transformer connected to a 120 V (rms) ac line is to supply 12.0 V (rms) to a portable electronic device. The load resistance in the secondary is 5.00 Ω. (a) What should the ratio of primary to secondary turns of the transformer be? (b) What rms current must the secondary supply? (c) What average power is delivered to the load? (d) What resistance connected directly across the 120 V line would draw the same power as the transformer? Show that this is equal to 5.00 Ω times the square of the ratio of primary to secondary turns.
Neon signs (which often contain gases other than neon) use high voltage to excite gaseous atoms that then give off a characteristic glow. When plugged into a wall outlet (120 V AC), a typical neon sign transformer delivers 400 W AC at a voltage of 18 kV rms. The primary coil has 400 turns. 1. First, what is the number of turns in the secondary to achieve this high voltage? Give your answer to 2 significant digits. 2. Next, if the transformer is ideal, what is the rms current in the primary? Give you answer in amps with 2 significant digits. 3. Finally, what is the rms current in the secondary? Give your answer in milli-amps with 2 significant digits.
A transformer has a ratio of 4:1. The high voltage side is connected to a 240 Vrms source. The low voltage side (secondary) is connected to an impedance ZL = 20 + j10 Ω.a. (in Vrms) What is the value of the source voltage when referred to the secondary? b. (in A rms) What is the current at the secondary?c. (in V rms) What is the voltage at the secondary?
An example power system has two distinct manufacturing areas, one with harmonic loads, and another with only linear loads. The portion of the system with the harmonic loads draws 75 A rms at 60 Hz, 10 A rms at 300 Hz, and 5 A rms at 420 Hz. The part of the system with only linear loads draws 75 A rms at 60 Hz. (i) What is the total load current (at 60 Hz) if both manufacturing plants are running? Calculate the THD. (ii) What is the total load current (at 60 Hz) if only the manufacturing plant with harmonic loads is running? Calculate the THD.
You are given five light bulbs designed to operate on 160 mA current at 3.0 V (rms values), arid want to connect them in parallel, through an ideal transformer, to 120 V rms AC household power. a) Draw a circuit diagram showing the AC power source (a generator symbol ), the transformer, and resistors for the light bulbs. b) Is the required transformer step-up or step-down? What turns ratio N5/N is needed? e) Calculate the ruts current through both the primary and secondary coils of the trans former, in mA.
An industrial load consumes 66 kW at a pf of 0.505 lagging from a 480-V rms line. The transmission line resistance from the power company's transformer to the plant is 0.08 Ω. Let us determine the power that must be supplied by the power company (a) under present conditions and(b) thy if the pf is somehow changed to 0.90 lagging. (It is economically advantageous to have a power factor as close to one as possible.
A 400-turns auto transformer, operating in the step-down mode with 25 percent tap supplies a 4.8 kVA, 0.85 lagging power factor load. The input to the transformer is 2400 V, 60 Hz. Neglect the small losses and leakage effects. What will be the apparent power(in kVA) conducted and transformed respectively?
An AC generator having an internal resistance of 2 k*(omega) is connected to an LCR circuit in series as shown in the figure. If the generator supplies an electromotive force, E = 282 sen (100*pi*t) volt, calculate:a) the impedance of the circuitb) the rms value of the current in the circuitc) the voltage drop across L, C and R
A Step-down transformer at Van Eck power station in Windhoek operates at V=10 kV on the primary side during wintertime. The voltage drawn from the secondary side of the transformer is V = 118 Volts. What is the current in Amps, on the secondary side of the transformer if the average rate of energy consumption demand is at 112.3 kW?
A drilling machine is driven by a single-phase induction machine connected to a 110 V RMS supply. Assuming that the machining operation requires 1 kW, that the tool machine has 90 percent efficiency, and that the supply current is 14 A RMS with a power factor of 0.8. Find the AC machine efficiency.
Two electric devices A and B are connected in parallel, and the rms current in A is 15 amp. If the current in B lags behind A by pi/3 radians and the line current is 23.4 amp, determine the current in B. Ans:12 amps
Determine the amount of power, in watts, consumed by the transformer shown. Assume that the voltage source is ideal (Rs=50 mΩ), R1=5 Ω, and L1=250 mH. The frequency of the 120 V(rms) source is 60 Hz.