The statements given below are related to a step-down transformer. Tabulate them as those related to primary and secondary. Winding with thick wire. Current flowing at higher voltage. Winding with thin wire. Current flowing at low voltage.

A step-down transformer is normally used to reduce the voltage. It is a device which works on the principle of electromagnetic induction. Hence, the voltage in the primary side will be more and that in the secondary side would be less. So, the electric current in the primary side would be high and that of the secondary side would be less. The data given can be tabulated as shown below: Primary side Secondary side Winding with thin wire Winding with thick wire Current flowing at higher voltage Current flowing at lower voltage

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On what principle transformer works?

Important Questions on Electromagnetic Induction

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Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

A step-up transformer operates on a

230 V

line and a load current of

2 A

. The ratio of primary and secondary windings is

1 : 25

. Then the current in the primary is

MEDIUM

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

A power transmission line feeds input power at $3300 V$ to a step down transformer with its primary windings having $2000$ turns. What should be the number of turns in the secondary in order to get output power at $330 V$ ?

EASY

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

The statements given below are related to a step-down transformer. Tabulate them as those related to primary and secondary.

Winding with thick wire.
Current flowing at higher voltage.
Winding with thin wire.
Current flowing at low voltage.

EASY

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

How much current is drawn by the primary coil of a transformer, which steps down

220 V

55 V

to operate a device with an impedance of

275 Ω ?

EASY

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

A transformer has efficiency

80 %

. It works at

5 kW

and

150 V

. If the secondary voltage is

240 V

, the secondary current is

MEDIUM

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

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?

MEDIUM

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

A step-up transformer operates on a

230 V

line and supplies current of

2 A

to a load. The ratio of the primary and secondary windings is

1 : 25

. The current in the primary coil is

EASY

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

A step-down transformer has turn ratio

20 : 1

. If

8 V

is applied across

0.4 Ω

secondary then the primary current will be

EASY

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

A current of

6 A

is flowing at

220 V

in the primary coil of a transformer. If the voltage produced in the secondary coil is

1100 V

and

40 %

of power is lost, then the current in the secondary coil will be:

EASY

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

State the main difference between a step-up and step-down transformer.

EASY

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

A step down transformer, transforms a supply line voltage of

2200 V

into

220 V

. The primary coil has

5000 turns

. The efficiency and power transmitted by the transformer are

90 %

and

8 kW

respectively. Then the power supplied is

EASY

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

Draw a labelled diagram to show the various components of a step-down transformer.

EASY

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

The primary and secondary coils of a transformer have

50

and

1500

turns, respectively. If the magnetic flux

ϕ

linked with the primary coil is given by

ϕ = ϕ_{0} + 4 t

, where

ϕ

is in

weber

t

is time, in

seconds

and

ϕ_{0}

is a constant, then the output voltage across the secondary coil is

EASY

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

In step-up transformer, relation between number of turns in primary

(N_{p})

and number of turns is secondary

(N_{s})

coils is

HARD

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

Draw a labelled diagram to show the various components of a step-down transformer.

HARD

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

A transformer is used to light a

100 W

and

110 V

lamp from a

220 V

mains. If the main current is

0.5 A

. The efficiency of the transformer is approximately -

HARD

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

Describe the working of a simple step-up transformer.

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Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

In a transformer,

N_{p} = 500, N_{s} = 5000

. Input voltage is

20 V

and frequency is

50 H z

. What are the output voltage and frequency?

MEDIUM

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

A step up transformer operates on a

220 V

line and supplies to a load of

2 A

. The ratio of primary to secondary windings is

1 : 25

. Determine the primary current.

EASY

Science>Physics>Electromagnetic Induction>Mutual Induction and Transformer

In an ideal transformer, the voltage and the current in the primary are 200 volt and 2 amp. respectively. If the voltage in the secondary is 2000 volt. Then value of current in the secondary will be

On what principle transformer works?

Important Questions on Electromagnetic Induction

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