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Sizing a 120V to 24V transformer?

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edmac

New User
Location
Cobleskill, NY
Occupation
Civil Engineer
Sizing a 120V to 24V transformer? Do I match Amps of Watts? I am passing 120V through the transformer to 24V thermostat then back through transformer to 120 Volt exhaust fan. (The thermostat is the inline switch to control the exhaust fan) ) if the 40VA transformer can handle 40W?, (V.A=W). The 24Volt @40Watts would handle 1.66 Amp) . But for the 120V load, (the 93 Watt load @ 120 Volt gives 1.3 Amps). Do I need a 100 Watt transformer or will the 40VA at 1.66 Amp do the work?
 
charlie b

charlie b

Moderator
Staff member
Location
Lockport, IL
Occupation
Semi-Retired Electrical Engineer
I am closing this thread in accordance with forum rules. We are not allowed to assist a person who is not an electrician to perform their own electrical work.
 
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