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प्रश्न
Transformer works on ______.
विकल्प
AC only
DC only
Both AC and DC
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उत्तर
Transformer works on AC only
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संबंधित प्रश्न
State the principle on which transformer works.
Complete the following sentence :
……… energy is converted into …………energy by an electric motor.
Explain why an induced current must flow in such a direction so as to oppose the change producing it.
How are the e.m.f in the primary and secondary coils of a transformer related with the number of turns in these coils?
What is the turns ratio i.e., transformer ratio, ns: np, in an ideal transformer which in-creases ac voltage from 220 V to 33000 V?
What is a transformer? On what principle does it work?
Name the principle on which functioning of a transformer depends.
A transformer is essentially an a.c. device. It cannot work on d.c. It changes alternating voltages or currents. It does not affect the frequency of a.c. It is based on the phenomenon of mutual induction. A transformer essentially consists of two coils of insulated copper wire having different numbers of turns and wound on the same soft iron core.
The number of turns in the primary and secondary coils of an ideal transformer is 2000 and 50 respectively. The primary coil is connected to a main supply of 120 V and secondary coil is connected to a bulb of resistance 0.6 Ω.
The value of current in the bulb is ______.
For an LCR circuit, the power transferred from the driving source to the driven oscillator is P = I2Z cos φ.
- Here, the power factor cos φ ≥ 0, P ≥ 0.
- The driving force can give no energy to the oscillator (P = 0) in some cases.
- The driving force cannot syphon out (P < 0) the energy out of oscillator.
- The driving force can take away energy out of the oscillator.
Derive the equation for a transformer.
