Some important points to remember The resistance of a conductor does not change when the current through it is changed or the voltage across it is changed. When current is changed, the voltage across it is also changed so that the ratio V/I = R The value of resistance changes if the dimensions (length or … Continue reading Electricity – Class X CBSE
At room temperature (27 oC) resistance of a heating element is 100 ohm. What is the temperature of the element if the resistance is found to be 117 ohm. Given, temperature coeff. of resistance of the material is 1.70 x 10 -14 oC-1 The ends of a resistance are connected to 19 cells in series, … Continue reading Numerical Problems for Practice – Current electricity
In a potentiometer arrangement a cell of emf 1.25 V gives a balance point at 35 cm length of the wire. If the cell is replaced by another cell, the balance point shifts to 63 cm. What is the emf of the second cell? E1= 1.25 V l1 = 35 cm l2 = 63 cm … Continue reading Current electricity – Numerical problems
Pawan Asked "What is meant by potential difference?" Answer: "Potential Difference between two points is the difference in Potential between the two points and is equal to the work done per unit charge ion carrying a positive test charge from one point to another against the electric field and without any acceleration"