Hi,<br/><br/>Is "on" used correctly in the sentences below?<br/><br/>The Simpsons is <b>on</b> at five o'clock.<br/>What channel is it <b>on</b>?<br/>Channel ten.<br/>Let's switch to channel ten. It's four fifty.<br/>Now the commercials are <b>on</b>.<br/><br/>By the way, what are the difference between advertisements and commercials?<br/><br/>Thank you