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Jay Ghosh

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Jay Ghosh

Asked: December 17, 2024In: Class 12 Physics

What is the fuction of a step up transformer?

To convert a low alternating voltage input into a high alternating voltage output. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.

Jay Ghosh

Asked: December 13, 2024In: Class 12 Physics

Why is core of a transformer laminated one?

In order to reduce eddy currents in the transformer. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.

Jay Ghosh

Asked: December 13, 2024In: Class 12 Physics

Can a transformer be used in d.c. circuits? Why?

No, because there is no change in magnetic flux in a d.c. circuit. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.

Jay Ghosh

Asked: December 13, 2024In: Class 12 Physics

A bulb and a capacitor are connectedin series to an a.c. source of variable frequency. How will the brightness of the bulb change on increasing the frequency of the a.c. source. Give reason.

Brightness of the bulb increases on increasing the frequencyof a.c. source because with increase in frequency capacitive reactance Xc and consequently the impedance decreases. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.

Jay Ghosh

Asked: December 13, 2024In: Class 12 Physics

Can the instantaneous power output of an a.c. source ever be negative? can the average power output be negative?

Instantaneous power output of an a.c. source can be negative but the average power output can never be negative. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.

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