Depends on what the area is. If it’s a rural place, Wood is cheep & easy to build. If there’s a lot of corrosion, strong weather/hurricane, bricks.
These applications DO NOT INVOLVE harmful ionizing energy:
- MRI
- ultrasound
- laser surgery
B: Extension Lines! You could have just searched this up on google
Battery based heaters use electric resistance heating, which uses a lot of current (electricity) to create the heat.