There is such a physics problem. When the voltage at both ends of a circuit is reduced to half of the original, and the resistance is increased to twice of the original, then the electricity passing through the circuit A the original quarter B the original half C the original double D cannot be determined

There is such a physics problem. When the voltage at both ends of a circuit is reduced to half of the original, and the resistance is increased to twice of the original, then the electricity passing through the circuit A the original quarter B the original half C the original double D cannot be determined

A. (U / 2) / 2R = I / 4

(2009 · Liangshan Prefecture) if a conductor is connected to a circuit and the voltage applied to both ends of the conductor is reduced to half of the original value, the resistance of the conductor and the current passing through it will be ()
A. All of them are reduced to half of the original B. all of them remain unchanged C. the resistance remains unchanged and the current is half of the original D. the resistance remains unchanged and the current is twice of the original

Resistance is a property of the conductor itself, which has nothing to do with the current passing through the conductor and the voltage at both ends of the conductor, so the resistance does not change. According to Ohm's law I = ur, when the resistance is constant, the voltage will be reduced by half, and the current will be changed to half of the original. So choose C