- #1
fisico30
- 374
- 0
Hello Forum,
Some electronic devices specify a certain specific voltage that they need to work properly. Some other devices specify a specific current...
Why? Why don't they all specify the voltage or the current?
If the current is specified, the voltage will be automatically fixed by the internal resistance R: V=IR...At the end of the day all devices require power, which is the product P=IV...
A power supply usually has an output voltage and a current rating. What does the current rating represent? The max current the power supply can output?
Why does a power supply provide a fixed voltage but varying currents? Does the current depend on the load?
thanks,
fisico 30
Some electronic devices specify a certain specific voltage that they need to work properly. Some other devices specify a specific current...
Why? Why don't they all specify the voltage or the current?
If the current is specified, the voltage will be automatically fixed by the internal resistance R: V=IR...At the end of the day all devices require power, which is the product P=IV...
A power supply usually has an output voltage and a current rating. What does the current rating represent? The max current the power supply can output?
Why does a power supply provide a fixed voltage but varying currents? Does the current depend on the load?
thanks,
fisico 30