This is about Shadowrun, where the geniuses that write the rules think you just run electricity into explosives to make it explode. Not only are they notably ignorant about how weapons, computer and explosives work, they are proud of their ignorance and have worked hard to maintain it.
"Plastic Explosives: Highly stable, moldable, and adhesive, plastic explosives are ideal for certain jobs—like blowing a hole in a wall. They are usually color-tinted to indicate the level of current needed to detonate them, from the black of magnetic-field induction to the chalky white of 440-volt industrial explosives."
Yeah, everyone needs commercial explosives that are so unstable that having anything that uses batteries within a few hundred feet blows you up.....
"Plastic Explosives: Highly stable, moldable, and adhesive, plastic explosives are ideal for certain jobs—like blowing a hole in a wall. They are usually color-tinted to indicate the level of current needed to detonate them, from the black of magnetic-field induction to the chalky white of 440-volt industrial explosives."
Yeah, everyone needs commercial explosives that are so unstable that having anything that uses batteries within a few hundred feet blows you up.....
There is no device that runs on 440 volts around your home, car batteries and wall outlets run 120Vac. even other countries cap out at 210, unless you bump up against a high voltage transformer. And that goes for magnetic field induction, it only works at very close range (contact), and batteries and small magnets don't cause INDUCTION! you have to be running power through them in a specific manner. Go pickup a mac notebook, they use magnetic induction now, you have to have the magnets touching and power running through one.
As for the question of whether mages in 4th ed are over powered, I would say no. I have only been playing 4th ed for about 3 months, I have been reluctant to switch because of the changes they made, including nerfing the mages. Direct combat spells were always partially balanced by the fact that you have to have line of sight on every target, even if a target is within the radius of a manaball spell does not mean they are hit if the mage cannot see them (ie behind cover.) Where as a fireball will hit everything. Atleast thats how it's been since I started playing 2nd ed 7 years ago.
Hell, my 3rd ed gm didn't even cap the overcast, he felt a mage can try to cast as much damage as they want, but if they died from drain then the spell fizzeled, I had a mage that managed to deal a light wound to a greater dragon with a fireball spell backed 18 points worth of foci, 12 of them being disposable, and casting the spell at 2 steps above Deadly. The ability of a 3rd ed mage to overcast and guarentee his enemies destruction was the whole point, lob a uber spell and then be useless for the rest of combat (ofcourse magic loss and foci addiction were par for the course.)