Current Electricity
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Current Electricity
Current density
Drift velocity
EMF of a cell E = Terminal Pd of cell
Terminal P.D. of cell when cell being discharged V = E - ir
Current in a circuit i =
Terminal P.D. of cell during charging is V = E + ir
Series Arrangement
Total resistance of circuit = R + nr Current I = Parallel Arrangement
Net internal resistance =
Total resistance of circuit =
Current Mixed Grouping
Net internal resistance =
Net resistance of circuit =
Current
Ohm's law
Reciprocal of resistance is conductance G =
Specific resistance
Specific conductance
Variation of resistance with temperature
R1 = R0 (1 + t) or
Comparision of resistance If 2 wires are made of different materials
If 2 wires are made of same material Resistance in series
R = R1 + R2 + R3 If n wires each having resistance R' are connected in series, equivalent resistance R = nR' Resistance in parallel
If 2 wires are connected in parallel R = Kirchhoff's rule
First rule Wheatstone's Bridge
Condition for balance is
The brides is most sensitive if P = Q = R = S
Equivalent resistance of balanced bridge across the ends of battery =
If
Potential gradient (X)
and R =
VB = VD
Current density
Drift velocity
EMF of a cell E = Terminal Pd of cell
Terminal P.D. of cell when cell being discharged V = E - ir
Current in a circuit i =
Terminal P.D. of cell during charging is V = E + ir
Series Arrangement
Total resistance of circuit = R + nr Current I = Parallel Arrangement
Net internal resistance =
Total resistance of circuit =
Current Mixed Grouping
Net internal resistance =
Net resistance of circuit =
Current
Ohm's law
Reciprocal of resistance is conductance G =
Specific resistance
Specific conductance
Variation of resistance with temperature
R1 = R0 (1 + t) or
Comparision of resistance If 2 wires are made of different materials
If 2 wires are made of same material Resistance in series
R = R1 + R2 + R3 If n wires each having resistance R' are connected in series, equivalent resistance R = nR' Resistance in parallel
If 2 wires are connected in parallel R = Kirchhoff's rule
First rule Wheatstone's Bridge
Condition for balance is
The brides is most sensitive if P = Q = R = S
Equivalent resistance of balanced bridge across the ends of battery =
If
Potential gradient (X)
and R =
VB = VD
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