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Risistors and Zeners

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AboZakaria

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why Risistors and Zeners rated bay watts for example a 1Watt 13 Volt Zenar Diode how much current it can pass without damage (1/13 A ?) and another Quastion 1200Watt Power inverter is tht mean 1200VA Power inverter ?And why most UPS Rated with VA and Inverter With Watts?
 
AboZakaria said:
why Risistors and Zeners rated bay watts for example a 1Watt 13 Volt Zenar Diode how much current it can pass without damage (1/13 A ?)
resistors,capacitors,zeners,transistor... all have a power limit mainly due to thermal reasons

Power == Voltage x Amperage and when something dissipates power it gets hot (thats how electric heaters work... just a resistive element). Too much heat and it damages the component (you would like to be put in a 100C oven ;) )

AboZakaria said:
and another Quastion 1200Watt Power inverter is tht mean 1200VA Power inverter ?And why most UPS Rated with VA and Inverter With Watts?
inverter in Watts? you sure. Inverters should be rated in VA since hte output is AC and I am 99.99999% that an inverter would NEVER be connected to an ideal resistive load, ie VA makes more sense
 
It is watts for calculating relative load. And it would be but it is just a matter of convertion.
 
ac uses VA instead of watts because of the potential differnece i phase between voltage and current.
 
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