Necessity is the mother of invention.
When you start your training in electrical, it shall become abundantly obvious what you need. I'm assuming you are working with a mentor since you are self proclaimed "Carpenter". You're mentor will show you all the correct tools.
That being said, I believe you can make more money being an electrician over a carpenter. I did both in the past, hence the comment.
In a nutshell, carpentry is more labor intensive, slightly less brain intensive (don't shoot me, just my experience).
Electrical work can be a bit less labor intensive (typically no gigantic beams to lift in electrical) and slightly more brain intensive. Although pulling wire and other similar activities can certainly work you hard. Not a lot of "whimpy" electricians out there.
Also seems like bad weather can affect you more in carpentry than electrical. (more unpaid days assuming you have outside carpentry)
Per my own opinion, electrical work is way more interesting than carpentry. I used to do all the staircases, cut multiple roof rafters...etc. Still like electrical much more.