What causes some stars to emit radio waves?

[shivakumar06]

dear sir
i want to know what happens in certain stars that helps it give out radio wave we detect by radio telescope. can we compare with inductor in electronic circuit?

 

[Simon Bridge]

That is a great thing to want to know - but a big subject. What have you found out so far?

Basically -
all stars give out radio waves
pulsars have a bright spot on their surface and they rotate.