How Do I Build a Current Sensor for Home Appliances?

[opt_help]

I'd like to build my own current sensor.

There's this site that I've seen h**p://www.coilgun.eclipse.co.uk/current_sensor_module.html
and there is this equation that i don't understand.. kindly help..

I actually want to sense current from running electrical appliances, (i.e. tv,electric fan)

Thank's for helping me out.

 

[Averagesupernova]

I'd like to build my own current sensor.

There's this site that I've seen h**p://www.coilgun.eclipse.co.uk/current_sensor_module.html
and there is this equation that i don't understand.. kindly help..

I actually want to sense current from running electrical appliances, (i.e. tv,electric fan)

Thank's for helping me out.

You have no choice. Appliances that aren't running draw no current. There may be a slight magnetizing current for a transformer or some standby current, but that is it.