Effect of Temperature on Resistance

The effect of temperature on the resistance of the conductor is increase in the resistance value with increase in temperature. The resistance of the conductor is proportional to the temperature. The increase in temperature of the conductor increases its resistance. The resistivity of the conductor change with temperature and it cause increase in resistance. The resistance of the conductor changes … Read more

How does Resistance Vary with Diameter?

The resistance is inversely proportion to the area of the conductor.The area is proportional to the square of the diameter.Therefore, the resistance is inversely proportional to the square of the diameter of the conductor. The area of a circular conductor is A= πD2/4 The resistance gets decreased as the diameter is increased. If ratio of resistance … Read more

A 20 ohm shunt is joined with an ammeter with 200 ohm resistance. It is joined to a 10v battery having a resistance of 4 ohm. What will the observation of the ammeter be?

 The circuit diagram of the problem is as given below. Ammeter shunt value is as shown in the circuit. The ammeter shunt is used to divert most of the circuit current towards shunt resistance and fraction of current towards the ammeter.   Total resistance of the circuit(R) = 4+(200 x 20/220) = 4+ 18.18 R=22.18 … Read more