What are primary and secondary sources of light ?

What are secondary sources light?

What are coherent sources of light ?

What are primary sources of light?

The ratio of the turns in the primary and secondary coils of transformer is1: 9. The ratio of the current in the primary to secondary is

The number of turns in the primary and secondary coils of a transformer are 200 and 800 respectively. If the voltage developed across the secondary is 240V, then the potential difference across each turn of the primary will be

What is primary succession?

What is secondary succession?

What is primary constriction?

A transformer with efficiency 80%works at 4 kW and 100 V.if the secondary voltage is 200V,then the primary and secondary currents are respectively

The stright line joining the sun and the observer along which centre of both the primary and secondary rainbow lies is called