The electric train model transformer plugs into 220-V ac and draws 0.35 A while supplying 10.5 A to the train, (a) What voltage is present across the tracks? (b) Is the transformer step-up or step- down?
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- If the voltage of the primary coil in a transformer is twice that of the voltage in the secondary coil, then the current in the secondary coil is ____ that of the primary coil. Question 4 options: four times twice as much the same as 1/2 as much 1/4 as much None of the other responses are correct.Does a transformer work when a DC current flows through the primary? If not, why?A transformer is to be used to provide power for a computer disk drive that needs 5.6 V (rms) instead of the 120 V (rms) from the wall outlet. The number of turns in the primary is 420, and it delivers 500 mA (the secondary current) at an output voltage of 5.6 V (rms). (a) Should the transformer have more turns in the secondary compared to the primary, or fewer turns? O There should be more turns in the secondary. O There should be fewer turns in the secondary. (b) Find the current in the primary. (c) Find the number of turns in the secondary. turns
- The primary coil of a transformer has 100 loops and is connected to a circuit with 120 volts (primary voltage). What is the output voltage (secondary voltage) if the secondary coil has 50 loops?A step-up transformer is designed to have an output voltage of 2 200 v (rms) when the primary is connected across a 110-V (rms) source. (a) If the primary winding has exactly 70 turns, how many turns are required on the secondary? turns (b) If a load resistor across the secondary draws a current of 1.40 A, what is the current in the primary, assuming ideal conditions? A (c) If the transformer actually has an efficiency of 94.0%, what is the current in the primary when the secondary current is 1.20 A?A 120-V AC input is given to the primary of an ideal transformer with 800 loops at the primary and 200 loops at the secondary. What is the voltage at the secondary side? ○ 40 V ○ 480 V 120 V ○ 30 V