Need to be improved by 5. If the resistance exceeds 0.5w, you can't get close to the circuit board, just put it on a tree or add long legs. 1w resistance needs to be increased by 5. The resistance of a conductor to current is called its resistance. Resistance is a physical quantity, which physically represents the resistance of a conductor to current. The greater the resistance of a conductor, the greater the resistance of the conductor to current. Different conductors generally have different resistances, and resistance is the nature of the conductor itself. The resistance of a conductor is usually represented by the letter R. The unit of resistance is ohm, abbreviated as ohm, and the symbol is ω.