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प्रश्न
What are step-up and step-down transformers?
उत्तर
- A transformer that increases the voltage by decreasing current is known as a step-up transformer.
- A transformer that decreases the voltage by increasing the current is a step-down transformer.
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संबंधित प्रश्न
How are the e.m.f in the primary and secondary coils of a transformer related with the number of turns in these coils?
The transformer is used in ______ current circuits.
The input and output voltages of a transformer are 220 V and 44V respectively. Find the current in input circuit if the output current is 2 A.
The primary coil of a transformer has 200 turns while the secondary coil has 1000 turns. What type of transformer is this? if the input voltage is 10V, what will be the output voltage?
Devices which is used to convert high alternating current to low alternating current is ______.
A 100% efficient transformer has 100 turns in the primary and 50 turns in its secondary coil. If the current in the secondary coil is 6 A, then the current in the primary coil is ______.
The self-inductance of a closely wound coil of 200 turns is 10 mH. Determine the value of magnetic flux through the cross-section of the coil when the current passing through the coil is 4 mA.
Explain why core of a transformer is always laminated.
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