HARD
12th Karnataka Board
IMPORTANT
Earn 100

Obtain the expression for the effective emf and the effective internal resistance of two cells connected in parallel such that the currents are flowing in the same direction.

Important Questions on Current Electricity

EASY
12th Karnataka Board
IMPORTANT
100 mg mass of nichrome metal is drawn into a wire of area of cross-section 0.05 mm2. Calculate the Resistance of the wire Given the density of nichrome 8.4×103 kgm-3 and resistivity of the material is  1.2×10-6 Ω m .
EASY
12th Karnataka Board
IMPORTANT
Define electrical resistivity of a material.
EASY
12th Karnataka Board
IMPORTANT
Write the expression for drift velocity in terms of current, explain the terms used.
MEDIUM
12th Karnataka Board
IMPORTANT
Two cells of emf E1 and E2, internal resistance r1 and r2 are connected in parallel such that they send current in same direction. Derive an expression for equivalent resistance and equivalent emf of the combination.
MEDIUM
12th Karnataka Board
IMPORTANT
Two resistors are connected in series with 5 V battery of negligible internal resistance. A current of 2 A flows through each resistor, if they are connected in parallel with the same battery a current of 253 A flows through combination. Calculate the value of each resistance.
MEDIUM
12th Karnataka Board
IMPORTANT

Graphically represent the variation of resistivity of a semiconductor with absolute temperature

EASY
12th Karnataka Board
IMPORTANT
Define 'drift velocity' of free electrons 
HARD
12th Karnataka Board
IMPORTANT

Write two limitations of Ohm's law.