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- A CONDUCTING WIRE OBEYS OHM"S LAW WHEN THE DEVICE IS INDEPENDENT OF THE MAGNITUDE AND THE POLARITY OF THE APPLIED DIFFERENCE .
- A CONDUCTING MATERIAL OBEYS OHM"S LAW WHEN THE RESISITIVITY OF THE MATERIAL IS INDEPENDENT OF THE MAGNITUDE AND DIRECTION OF THE APPLIED ELECTRIC FIELD .
- RESISTANCE OF A CONDUCTOR DEPENDS UPON THE DIMENSIONS AND THE NATURE OF THE MATERIAL ONLY AND IT IS INDEPENDENT OF THE DIMENSIONS OF THE CONDUCTOR .
- RESISTANCE IS A PROPERTY OF OBJECT.RESISTIVITY IS A PROPERTY OF A MATERIAL .
- THE RELATION V/ I =R HOLDS GOOD FOR BOTH OHMIC AND NON OHMIC CONDUCTORS.FOR CONDUCTORS R IS A CONSTANT AND FOR A NON OHMIC CONDUCTOR R IS NOT A CONSTANT FOR DIFFERENT VALUES OF V AND I
- WHEN RESISTANCES ARE CONNECTED IN SERIES ,THE CURRENT THROUGH EACH RESISTANCE IS SAME .
- WHEN RESISTANCES ARE CONNECTED IN PARALLEL ,THE POTENTIAL DIFFERENCE ACROSS EACH RESISTANCE IS THE SAME
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(posted on 13 Jul 2007 22:58:13 IST)
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| jkl |
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