Powerpoint is good. So are transparencies, flipcharts and chalkboards.
You need to use the appropriate media for the presentation. Work to its strengths. For example, powerpoint is very linear, can have some flash, allows you to control timing very well. It's very well suited for lectures. But...
"How can I impress on him that he is not qualified to do my job (let alone qualified to judge me!) and that he has much to learn about what me and my peers do for the industry?"
Hoo, boy, with that attitude, you're lucky to be employed! Of COURSE he's qualified to judge you. He's the boss. If...
Without knowing if you mean "turning off a switch" or "unbolting a bus bar", it's hard to answer. But here is the spectrum that I've seen:
An electrician on an aircraft carrier had a bus bar come disconnected in a 480V switchgear, with the resultant arc causing a fireball and molten metal...
