What is Transformer? Explain step up and step down transformer?

Distinguish between Step up and Step Down Transformer.

A portable radio has a built in transformer so that it can work form the mains instead of batteries. Is this a step - up or step down transformer ?

What is increased in a step-down transformer?

A transformer contains 100 and 150 turns in its primary and secondary coils, respectively. The transformer is a (A) Step up tranformer (B) Step down transformer

The transformation ratio in the step-down transformer is

A thermal power plant produces electric power of 600 kW at 4000 V, which is to be transported to a place 20 km away from the power plant for consumers' usage . It can be transported either directly with a cable of large current-carrying capacity or by using a combination of step-up and step-down transformers at the two ends. the drawback of the direct transmission is the large energy dissipation is much smaller. In this method, a step-up transformer is used at the plant side so that the current reduced to a smaller value. At the consumers' end. a step-down transformer is used to supply power to the consurmer at the specified lower voltage . it is reasonable to assume that the power cable is purely resistive and the transformers are ideal with a power factor unity. All the currents and voltages mentioned are rms values. In the method using the transformers, assume that the ratio of the number of turns in the primary to that in the secondary in the step-up transformer is 1 : 10. If the power to the consumer has to be supplied at 200 v, the ratio of he number of turns in the primary to that in the secondary in the step-down transformer is

Condition for step-down transformer is: