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how to know the zenor diode how much watt and how much voltage

Normally this info is derived from the datasheet when you know the part number. Are there any markings you can read.

Without that Zener and other diodes come in various package sizes to determine the wattage. Like resistors 1/8W, 1/4W, 1/2W, 1W, 5W are common sizes. Physically, how large is this diode?

Determining the voltage is easy, simply apply a larger voltage across the diode in the reverse bias direction (make sure this voltage has a low current limit) and simply measure the voltage drop across the diode. If it is only less than 1V, you probably have it backward. Vz up to 15V is common but a few larger voltages do exist.

8 AAA batteries in series with a 1K resistor should make a safe enough voltage source up to 12V

Hi, newone.
Tell us what you're up to. It looks like you're creating a topic to get an education on each and every type of semiconductor out there. No problem with that but what are you doing with all this knowledge? Writing a book? Attending a class? Inquiring minds want to know.

The current ,...by size.

The voltage and any other specs, by its markings.

i learn electronics. how to repair powersupply

of digital reciever

the zenor diode that i am have no written

its red colour whhith black

newone, you can get a lot of information from google. I'd google for ####7 and tutorial.

Also, wikipedia has a lot of beginner information on electronic devices.

You should use the internet for information first then post here to clear up confusions.

Phil.