Transformer

In a transformer turn’s ratio refers to

A generator supplies $100 \mathrm{V}$ to a transformer's primary coil, which has $100$ turns. If the secondary coil has $500$ turns, what is the secondary voltage?

A transformer with $8:1$ turns ratio has $60\mathrm{Hz}$, $120\mathrm{V}$ input. The frequency of the output is:

A generator supplies $100 \mathrm{V}$ to a transformer's primary coil, which has $100$ turns. If the secondary coil has $500$ turns, what is the secondary voltage?

The basic principle on which the transformer works is

Step-up transformer is used to reduce the output voltage while step-down transformer is used to increase the output voltage.

A power transmission line feeds input power at $2300 \mathrm{V}$ to a stepdown transformer with its primary windings having $4000$ turns. What should be the number of turns in the secondary in order to get output power at $230 \mathrm{V}$?

The output voltage of an ideal transformer, connected to a $240 \mathrm{V}$ AC mains, is $24 \mathrm{V}$. This transformer is used to light a bulb with rating $24 \mathrm{V}, 24 \mathrm{W}$. Calculate the current in the primary coil of the circuit. 

In a step-up transformer the turn ratio is $1:2$. A Leclanche cell $(\mathrm{e}\mathrm{m}\mathrm{f}=1.5\mathrm{ }\mathrm{V})$ is connected across the primary. The voltage across the secondary is _____ $\mathrm{V}$.

The primary of a transformer has $40$ turns and works on $100$ Volt and $100$ Watt. Find the number of turns in the secondary to step up voltage to $400 \mathrm{V}$. Also calculate the current in the secondary and primary.

What is step up and step down transformer?

What is a transformer? Explain its working with construction. Derive an expression for e.m.f and current in terms of number of turns in primary and secondary coil. 

The ratio of number of turns in primary and secondary coil of a transformer is $1 : 4$. What type of transformer it is?

__________ increases in a step down transformer.

A $220$ volt input is supplied to a transformer of efficiency $80\%$ and the output circuit reading draws a current of $2.0$ ampere at $440$ volts. The current drawn by the primary windings of the transformer is

A transformer of frequency $60 \mathrm{Hz}$ and $120 \mathrm{V}$ input has$8:1$ turns ratio. The frequency of output is:

_____ transformer is used to convert $220 \mathrm{volts}$ to $5 \mathrm{volts}.$

A $220$ $\mathrm{V}$ input is supplied to a transformer. The output circuit draws a current of $2.0 \mathrm{A}$ at $440 \mathrm{V}$. If the efficiency of the transformer is $80\%$, find the current $\left(\text{in} \mathrm{A}\right)$ drawn by the primary windings of the transformer:

A step down transformer has a total power input of $220 \mathrm{k}\mathrm{W}$ at $11000 \mathrm{V}.$ What will be the input current?

A transformer of $100\%$ efficiency has $200$ turns in the primary coil and $40000$ turns in the secondary. It is connected to a $220\mathrm{ V}$ mains supply, and the secondary coil feeds a $100\mathrm{ }\mathrm{k}\mathrm{\Omega }$ resistance. The potential difference per turn is