English

What Type of Current is Transmitted from the Power Station? - Physics

Advertisements
Advertisements

Question

What type of current is transmitted from the power station?

Solution

An alternating current is transmitted from the power station.

shaalaa.com
  Is there an error in this question or solution?
2015-2016 (March) Science Paper 1

RELATED QUESTIONS

Name two factors on which the magnitude of an induced e.m.f. in the secondary coil depends.


Complete the following sentence :
……… energy is converted into …………energy by an electric motor.


How are the e.m.f in the primary and secondary coils of a transformer related with the number of turns in these coils?


Mention the two characteristic properties of the material suitable for making core of a transformer.


Name three losses of energy in a transformer. How are they minimized?


The primary of a transformer has 40 turns and works on 100 V and 100 W. Find a number of turns in the secondary to step up the voltage to 400 V. Also calculate the current in the secondary and primary.


The transformation ratio in the step-up transformer is ______.

Read the following paragraph and answer the question:


Long distance power transmissions

The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped up. It is then transmitted over long distances to an area sub-station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes.

We need to step-up the voltage for power transmission, so that ______.


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 primary coil is ______.


A step-down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×