Primary winding and secondary relationship questions

Transformer — Collection of Solved Problems

between the primary and secondary windings to attenuate transient Transformer Questions & Answers. 6. . winding in relation to the secondary winding. Calculate the voltage output by the secondary winding of a transformer if the primary voltage is 35 volts, the secondary winding has turns, and the primary. Motley Fool issues rare "double down" buy alert. How do I identify the primary coil and secondary coil of a transformer which has a 20V rating on it?.

This device is called a transformer. I drew them at different amplitudes for the benefit of the reader: Ask your students how the secondary coil would have to be made in order to truly generate a voltage greater than the applied primary coil voltage.

How about generating a secondary voltage less than the primary? Identify the polarity of voltage across the load resistor at this exact moment in time, as well as the direction of current in each of the windings.


Hide answer Follow-up question: One perspective that may help students understand the directions of current through each winding of the transformer, in relation to the voltage polarities, is to think of each winding as either being a source of electrical power or a load. Imagine these sources and loads are DC so we may maintain the same polarity of voltage, for the sake of analysis. Which way would you draw the currents for a DC source and for a DC load?

Question 11 The ignition coil of a gasoline-powered internal combustion automobile engine is an example of a transformer, although it is not powered by alternating current. Explain how a transformer may be operated on electricity that is not AC: Hide answer In order for a transformer to function, the primary winding current must change rapidly with regard to time.

Step-up, Step-down, and Isolation Transformers | AC Electric Circuits Worksheets

Whether this is a current that truly alternates, or just one that pulses in the same direction, is irrelevant. Answer Did you use the correct relationship? Did you substitute the numbers in the correct places? And did you remember to include the unit in your final answer?

Step-up, Step-down, and Isolation Transformers

This is because not all of the input electrical energy is transferred to electrical energy at the output. There is some heat generated and also a little bit of sound - transformers get hot and hum!

You should always state that energy is lost as heat, rather than sound, since most of the electrical energy lost is transformed into heat. The following relationships will be useful.


This means the input power is equal to the output power. This equation is more useful when it is rearranged: Question A transformer is used to produce an output voltage of 20 V from the mains supply. The primary coil has 34 turns.

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How many turns are there on the secondary coil of the transformer? The current in the secondary coil of the transformer is 0. Calculate the current in the primary coil of the transformer.