Eventhorizon
New Member
Can someone help me with a basic AC current formula?
And a formula for step-up transformer ratios/power?
In DC, based on Ohms Law, Volts divided Resistance = Amps
and Volts divided by Amps = Res(Ohms)
What is the same equivalent for AC?
I have a relay where the coil is designed to work on 24VAC. Res is about 12 ohms.
24/12=2Amps in DC But this relay uses only a couple hundred mA as per my AC amp meter.
In AC current, if I know the Voltage and the Resistance how do I get the Amps using an exact formula?
And is this same formula the same, if it is a perfect sine wave versus a square wave?
I am trying to built a 12VDC to 24VAC inverter that will give me at least 1.5Amps.
Will settle for 1Amp.
Is an AC square wave ok for these 24VAC coils? The inverter would be much easier to build.
I understand, that with even 12VDC they work but the coil gets hot after a few seconds….and it seems that if less is used, say about 8VDC, its not enough juice for the coil.
I found the attached schematic to make a simple square wave inverter. Based on the transistors it will provide 1 Amp at 24VAC
How do I calculate the step-up transformer I need.
1)Coil ratio
2)Watts (heat dissipation) VA rating? (how thick the coil windings need to be)
Size is important because I am using a project box of a specific size, with a self contained battery to be handheld unit.
The size of the step-up transformer I believe is what will be my biggest enemy for what I want to accomplish.
Can anyone help me?
Any thoughts?
And a formula for step-up transformer ratios/power?
In DC, based on Ohms Law, Volts divided Resistance = Amps
and Volts divided by Amps = Res(Ohms)
What is the same equivalent for AC?
I have a relay where the coil is designed to work on 24VAC. Res is about 12 ohms.
24/12=2Amps in DC But this relay uses only a couple hundred mA as per my AC amp meter.
In AC current, if I know the Voltage and the Resistance how do I get the Amps using an exact formula?
And is this same formula the same, if it is a perfect sine wave versus a square wave?
I am trying to built a 12VDC to 24VAC inverter that will give me at least 1.5Amps.
Will settle for 1Amp.
Is an AC square wave ok for these 24VAC coils? The inverter would be much easier to build.
I understand, that with even 12VDC they work but the coil gets hot after a few seconds….and it seems that if less is used, say about 8VDC, its not enough juice for the coil.
I found the attached schematic to make a simple square wave inverter. Based on the transistors it will provide 1 Amp at 24VAC
How do I calculate the step-up transformer I need.
1)Coil ratio
2)Watts (heat dissipation) VA rating? (how thick the coil windings need to be)
Size is important because I am using a project box of a specific size, with a self contained battery to be handheld unit.
The size of the step-up transformer I believe is what will be my biggest enemy for what I want to accomplish.
Can anyone help me?
Any thoughts?