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The number of primary windings and secondary windings of a transformer are not the same.
The core of a transformer is laminated. Why?
Transformers are used in mobile chargers. Give reason(s).
Draw the magnetic field lines around the current-carrying straight wire and solenoid.
Define magnetic flux.
The number of secondary windings in the coil of a transformer used in a microwave oven is 12 times the number of windings in the primary coil. If it is connected to a source of 220 V, what is the secondary voltage obtained from the transformer?
What is electromagnetic induction?
State Faraday's law of electromagnetic induction.
A bulb connected to a dynamo attached to the tire of a bicycle is not found to be glowing with steady brightness. It was found that the bulb was bright, dimmed, and also turned off when the cycle came to rest. Mention the reasons for such observations based on the working principle of dynamo.
What can be done to increase the magnitude of current produced by a dynamo? Write any two ways.
What is a transformer?
Draw the block diagrams of the step-up transformer and step-down transformer and write two uses of each.
To charge a laptop of 20V, a charger with 550 primary turns is connected to an A.C. source of 220 V. Calculate the number of secondary windings of the charger.
The number of secondary windings in the coil of a transformer used in a microwave oven is 10 times the number of windings in the primary coil. If it is connected to a source of 220 V, what is the secondary voltage obtained from the transformer?
The ratio of the number of the primary winding to the number of secondary windings of a transformer is 22:1. If an adopter with that transformer is connected to an electric circuit having a potential difference of 220 V, calculate the output voltage so obtained.
An electric material production company saw the demand of transformer in the market.
- If the company manufactures transformers with number of primary coil 200 turns and secondary coil 100 turns. What type of transformer is formed?
- If 50V DC is passed in the primary coil in the transformer manufactured by the company, what will be the secondary voltage?
- What is the relation between input and output energy in the transformers?
- What is the use of transformer given in no. '1', in our daily life?
A 12 V rickshaw is charged at a charge station in. Dhangadhi. It is charged using a transformer having 550 turns in primary coil connected in 220 V AC, line.
- Calculate the number of turns in secondary coil of transformer.
- Mention the type of transformer used to charge rickshaw. Write down one difference between this transformer and the transformer used in power house.
Electricity supply in your house is of 220 V. You have two transformers one with more number of turns in primary coil than in secondary coil and another with less number of turns in primary coil than in secondary coil. Which transformer will you select to play a radio set that needs 12 V?
In what two ways electric generator differs from electric motor?
When 220 V is passed in the primary coil of a transformer, 440 V is induced in secondary coil. If the number of turns in secondary coil is 350:
- What will be the number of turns in primary coil?
- What will happen if core of a transformer is not laminated?
- Can it be used by connecting with battery?
Which physical quantity always remains the same in a transformer?
If number of turns of wire in primary coil of a transformer shown in the diagram is 4 times more than that in secondary coil. What will be the value of secondary voltage?
What is the major similarity in electric motor and current generator?
Which one is the way to increase the magnitude of induced emf in a generator?