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XI - SCIENCE
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BASIC ELECTRICITY AND
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NETWORK THEOREMS OHM’S LAW Ohm’s law states this relationship in simple words ‘‘the current flowing circuit (I) is directly proportional to applied voltage (V) provided resistance in the circuit is constant ’’
IαV or VαI
1.Resistance =
Voltage V OR R= Current I
2.Voltage=Current×Resistance OR V= I×R
3.Current
Voltage V OR I Resistance R
VOLTAGE Voltage is necessary to set up the current flow. Voltage is also known as
'' potential difference '', '' EMF '' In actual practice voltage source is of two types 1. AC Voltage (Alternating Current type) 2. DC voltage (Direct Current type)
CURRENT An electric current through a conductor is a flow of electrons; actually electric charge in motion is called as current.
Conventional Current The electron flow is always from-Ve terminal to +Ve terminal of the battery but theoretically it is assumed
to be from positive to negative, because as a
convention, electric current direction a conventional current from positive to negative.
Basic Electricity And Network Theorems
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