A step down transformer has a turn ratio of `20 : 1`. If 8 volt are developed across `0.4 Omega` secondary, then the primary current will be:

A step down transformer has turns ratio 40:1. (i) If the primary voltage is 240V, calculate the secondary voltage. (ii) If the secondary current is 4A, calculate the primary current.

A step up transformer has turns ratio 10 : 1 . A cell of emf 2 volts is fed to the primary. Secondary voltage developed is

A step up transformer has turn ratio 10:1 . A cell of e.m.f 2 volts is fed to the primary . Secondary voltage developed is :

A step up transformer has turn ratio 10:1 . A cell of e.m.f 2 volts is fed to the primary . Secondary voltage developed is :

In a step up transformer, the turn ratio is 1:10. A resistance of 200 Omega connected across the secondary draws a current of 0.5 A. What is the primary voltage?

A transformer of efficiency 90% has turns ratio 10 : 1. If the voltage across the primary is 220 V and current in the primary is 0.5 A, then the current in secondary is

The ratio of the number of turns in the primary and the secondary coils of a step down transformer is 1:200 . It is connected to a.c. mains of 200 V. Calculate the voltage developed in the secondary. Determine the value of maximum current in the secondary, when a current of 2.0 A flows through the primary.