What is an electric shock? It’s a a sudden discharge of electricity through a part of the body. For a sudden discharge of electricity, the prime need is a potential difference. When the bird perches on an electric line, it is at a high potential, but it is not subjected to a high potential difference between…… Continue reading Why don’t the birds perching on high power electric lines do not get an electric shock?
Power is directly proportional as well as inversely proportional by two formulae.How does one justify? P=V2/R as well as p=I2 R. Answer: This means that for a given current, (i.e, when current is kept constant) Power is directly proportional to resistance. eg, when a number of appliances are connected in series, the same current…… Continue reading Proportionality relation in electric power
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