If the resistance in a circuit connected to a constant current is halved, how is the voltage in the circuit affected? the voltage remains constant. the voltage is doubled. the voltage is reduced by a factor of 4.the voltage is reduced by a factor of 2.the voltage is quadrupled.

The voltage is reduced by a factor of 2.

Explanation:

According to the OHM's law, Voltage is directly proportional to the resistance keeping the current constant

           Voltage = Current × resistance

                       V = I × R

when I is constant,   V ∝ R

It can be seen that by keeping the current constant, as we halved the resistance, voltage will be halved.

For Example

Consider,     I = 10 A             R = 10Ω

then             V = I × R = 10 × 10 = 100 V

Keeping current constant and by halving the resistance i.e R = 5Ω

                    V = I × R = 10 × 5 = 50 V

Hence, resistance in a circuit is halved, Voltage will be halved.

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.