Oven won't heat. My burners work, the digital display works, but no heating in the oven cavity. I

Question

My burners work, the digital display works, but no heating in the oven cavity. I don't smell gas. Help, what could it be? I just would like to know before I call repairman so I don't look so 'dumb woman'.When i turn on my oven it blows the main fuse in the plug - it is a gas oven with electronic ignition. There is no gas coming out in the oven but all the burners on the top still work ok. Is this an electrical fault or a gas fault?