© examsnet.com
Question : 27
Total: 35
An alternating voltage of 220 V is applied across a device X . A current of 0.22 A flows in the circuit and it lags behind the applied voltage in phase by π ∕ 2 radian. When the same voltage is applied across another device Y , the current in the circuit remains the same and it is in phase with the applied voltage.
(i) Name the devicesX and Y and,
(ii) Calculate the current flowing in the circuit when the same voltage is applied across the series combination ofX and Y .
(i) Name the devices
(ii) Calculate the current flowing in the circuit when the same voltage is applied across the series combination of
Solution: 👈: Video Solution
(i) Since, current lags behind the voltage, X is an inductor.
Since, current and voltage remain in phase,Y is a resistor.
(ii) Since,X L =
=
= 1000 Ω
And,R =
= 1000 Ω
Z = √ R 2 + X L 2
= √ ( 1000 ) 2 + ( 1000 ) 2
= 1000 √ 2 Ω
So, the required current=
=
= 0.155 A
Since, current and voltage remain in phase,
(ii) Since,
And,
So, the required current
© examsnet.com
Go to Question: