I think you are confusing a trade description of 'electrician' with a electronics type vocation?
Electricians deal with the distribution of supply from power stations to the home and there are niche components of what a typical "electrician" may get up too in those environments. The only 'computer' stuff they may deal with (that i can think of) would be adjusting power factor correction units, solar invertor's, PLC things; but typically an average domestic or industrial electrician will just plug & play those devices and the real skill of their work lies in how they build their networks of electrical components (eg switchboard to circuit breaker to cable to a power point..) and their knowledge of how what they are building complies with Australian Standards & Regulations.
If you are interested in computers, you should see Squar3roots link above and/or consider if electrical / electronic engineering is what you are actually thinking about instead. A qualification in "computer hardware" is pretty vague!