Why the shock of alternating current is attractive ?

Why the shock of    alternating current  is   attractive ? Answer: Shock is never attractive. I have experienced shock from AC several times, but never felt any attraction. But, during a severe shock it seems that the person  is attracted by the electricity due to the fact that the electricity temporarily disables his nervous […]

Class 12 Physics Study materials – Free Download

Class 12 students can download study materials in Physics here. The materials are prepared by experts in the field and can be used for first time study or  for a quick revision. Electrostatics Current Electricity Magnetic Effect of Current and Magnetism Electromagnetic induction and AC Electromagnetic Waves Optics Dual Nature of matter and energy Atoms […]

Current Electricity : Some important Questions and Answers

Current electricity is one of the interesting as well as scoring chapter for the students of Class XII. Please find below a collection of questions and answers commonly asked in various Board Exams current electricity

A Question from Current Electricity

Pratham asked: The resistances of 2 bulbs are in the ratio 1:2.if they are joined in series,find the ratio of the energy consumed by the 2 bulbs?   Answer: When connected in series, the same current flows through each of the resistors. Therefore, the energy dissipated is directly proportional to their resistances. That is, the…… Continue reading A Question from Current Electricity

Numerical Problems for Practice – Current electricity

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

Current electricity – Numerical problems

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

Resistance and Resistivity

Simran Asked “Two wires A and B of equal lengths,different cross-sectional areas and made of same metal a)name the property which is same for both the wires. b)name the property which is different for both the wires” Answer: Since both the wires are of same metal, the resistivity will be same for both whereas since…… Continue reading Resistance and Resistivity