MEDIUM
12th Punjab Board
IMPORTANT
Earn 100
With the help of labelled diagram, describe the principle, construction and working of a transformer.
Important Questions on Alternating Current
MEDIUM
12th Punjab Board
IMPORTANT
A capacitor of unknown value and an inductor of and a resistor of are connected in series to a ac source. It is found that the power factor of circuits is unity. Calculate the capacitance of capacitor and maximum amplitude of the current..
EASY
12th Punjab Board
IMPORTANT
A series L-C-R circuit with is connected to a variable frequency a.c.supply.When the frequency of the supply equals the natural frequency of the circuit, what is the average power transferred to the circuit in one complete cycle.