Add 3V to a 1 ohm resistor, and I =? P =? If the maximum power of the resistor is 25W, how much voltage can it bear If it works in a circuit with 15V input, 5V output and 3a current, can it work?

Add 3V to a 1 ohm resistor, and I =? P =? If the maximum power of the resistor is 25W, how much voltage can it bear If it works in a circuit with 15V input, 5V output and 3a current, can it work?

I = u / r = 3 / 1 = 3 A
Because the square of u equals p * r = 25
So the maximum u is 5 volts
The current and voltage are within the rated range
So it can work normally

If the rated power of a 1 ohm resistor is 25W, does it mean that its maximum working voltage is sqrt (p * r)?
Is not the resistance without rated voltage, only the maximum working voltage

Generally, we don't consider the withstand voltage of resistance. The power of 25W can be understood as its dissipative power, that is, the power generated when the current flows through the resistance, P = the square of the current * resistance, that is, the current can't exceed 5A. When it is equal to 5A, the voltage at both ends is 5V. If it is used for heating, it needs to be calculated to ensure that the current doesn't exceed the standard