Home
Class 12
PHYSICS
Transformer is used to...

Transformer is used to

A

convert AC to DC voltage

B

convert DC to AC voltage

C

obtain desired DC power

D

obtain desired AC voltage and current

Text Solution

Verified by Experts

The correct Answer is:
D
Transformer is used to obtain desired AC voltage and current because a transformer is a device based on the principle of mutual induction, which is used for converting large AC at low voltage into small current at high voltage.
Promotional Banner

Similar Questions

Explore conceptually related problems

The output voltage of an ideal transformer, connected to a 240 V a.c. mains is 24 V. when this transformer is used to light a bulb with rating 24 V, 24 W, calculate the current in the primary coil of the circuit.

1 MW power is to be delivered from a power station to a town 10 km away. One uses a pair of Cu wires of radius 0.5 cm for this purpose. Calculate the fraction of ohmic losses to power transimitted if (i) power is transformer is used to boost the voltage to 11000 V, power transmitted, then a step down transformer is used to bring voltages to 220 V. (rho_(Cu) = 1.7 xx 10^(-8) SI unit)

A power transformer is used to step up an alternating emf of 200V to 4 KV and to transmits 5KW power. If the primary is of 1000 turns, calculate, assuming the transformer to be ideal. (i) The number of turns in the secondary (ii) The current rating of the secondary

A step - up transformer is used on 120 V line to provide a potential difference of 2400 V . If the number of turns in the primary is 75, then the number of turns in the secondary shall be

A step-down transformer is used on a 1000 V line to deliver 20A at 120V at the secondary coil. If the efficiency of the transformer is 80% the current drawn from the line is.

A step down transformer is used at 220 V to provide a current of 0.5 A to a 15 W bulb. If the secondary has 20 turns, find the number of turns in primary coil has current that flows in primary coil.

Can a transformer be used to alter DC voltage?

Why cannot a transformer be used to step up d.c. voltage ?