Iknow that my heat recovery ventilator consumes 83.2 watts of power to run its fans when supplying balanced fresh air into my house. if it runs 24 hrs a day, how many kwh's of energy would it consume in a year?

730 kWh

Explanation: To solve this problem we have to use the following considerations:

If teh heat recovery ventilator consumes 83.2 W running 24 hs we have a consumed energy of:

Energy consumed= 83.2* 24= 2 kWh

so in a year we must multiply by 365 then

Energy consumed in a year= 2kWh*365= 730 kWh

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

there are no contact forces mentioned on the list of choices that you've provided.