Menticol
Active Member
Hello guys
My electronics knowledge is very corroded, I'm having troubles doing some simple calculations.
Let's suppose I have a 120V to 12V stepdown transformer, connected to a 12V 50W bulb.
The load draws W / V = A => 4,16 A at 12V
But how many amps does the transformer draw at 120V?
Another example: I have a solar cell capable of delivering 235W at 29VDC. How many of these cells do I need to power up, lets say, a 120VAC 50W load (using an inverter)?
I imagine that the efficiency of the transformer and the inverter must be taken in account, but I don't know how
Thank you in advance
My electronics knowledge is very corroded, I'm having troubles doing some simple calculations.
Let's suppose I have a 120V to 12V stepdown transformer, connected to a 12V 50W bulb.
The load draws W / V = A => 4,16 A at 12V
But how many amps does the transformer draw at 120V?
Another example: I have a solar cell capable of delivering 235W at 29VDC. How many of these cells do I need to power up, lets say, a 120VAC 50W load (using an inverter)?
I imagine that the efficiency of the transformer and the inverter must be taken in account, but I don't know how
Thank you in advance
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