- #1
iScience
- 466
- 5
Hi,
Since the primary side of a transformer is a closed circuit (like the cubical adapter for the iphone charger), it would make sense that even if my iphone wasn't plugged into the secondary, the primary would still draw power.
I know this is the case for at least some adapters, because i see arcing sometimes when i plug my laptop adapter into the wall without my laptop being plugged into the secondary.
But some adapters only start getting hot when i plug in load at the secondary. Why?
also
When the secondary load is connected to make the secondary a closed circuit, does its induced emf change the impedance for the primary side?
Since the primary side of a transformer is a closed circuit (like the cubical adapter for the iphone charger), it would make sense that even if my iphone wasn't plugged into the secondary, the primary would still draw power.
I know this is the case for at least some adapters, because i see arcing sometimes when i plug my laptop adapter into the wall without my laptop being plugged into the secondary.
But some adapters only start getting hot when i plug in load at the secondary. Why?
also
When the secondary load is connected to make the secondary a closed circuit, does its induced emf change the impedance for the primary side?