# Can this circuit be called a 12v,5A zener regulator?

If this circuit can be called a 12v,5A zener regulator, then I know that 12v here is the varying input voltage. What is the 5A current here,I mean where can it be represented in the picture?

• What circuit or picture? Jun 4 '15 at 2:41
• now can you see @PeterBennett
– ema
Jun 4 '15 at 2:43
• Vout MAX = V zener | Vout = Vin - (R x Iload) | This can fall to below Vzener. | Power in resistor = (Vin-Vzener)^2/R Jun 4 '15 at 3:21
• Since you haven't provided values for either component, it's impossible to say what its voltage or current rating might be, but trying to use a zener shunt regulator to supply more than a few milliamps is insanity. Jun 4 '15 at 6:25
• This kind of circuit does work as a voltage regulator. Only operating it with currents of 5A would be very impractical. This is a consequence of simplicity of this circuit. At a few milli Amperes it would work fine. But in theory: yes it can be a voltage regulator. Now calculate how much power goes in and how much comes out when Vin = 12V, Vout = 9 V and I = 5A You will find that a lot of power is turned into heat. That's why it's impractical for 5A. Jun 4 '15 at 6:54