A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?
A. 220V
B. 220/ 2V
C. 110V
D. 220 √2V
Alternating Current
The frequency of a circuit consisting of a capacitance C and a resistor R is________________?
The frequency of a circuit consisting of a capacitance C and a resistor R is________________?
A. C/R
B. R/C
C. 1/RC
D. 1/ 2RC
What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?
What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?
A. 0.5 mH
B. 0.5H
C. 2.0H
D. 8.0H
When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?
When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?
A. Same
B. Different
C. At L will be more than at C
D. At L will be less than at C
Ammeter connected in an AC circuit measures______________?
Ammeter connected in an AC circuit measures______________?
A. The exact value of the current
B. RMS value of the current
C. The net value of the current
D. The peak value of the current
A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?
A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?
A. (R+2πfL)
B. R+1/2πfL
C. (R2+f2L2)
D. (R2+4π2f2L2)
If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb________________?
If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb________________?
A. Remains same
B. Brightness increases
C. Brightness decreases
D. No light
A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________?
A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________?
A. 32Ω
B. 62Ω
C. 50Ω
D. 100Ω
In the capacitive circuit the current___________________?
In the capacitive circuit the current___________________?
A. Lags behind voltage by π/2
B. Is in phase with voltage
C. Opposite in phase of voltage by π
D. Leads forward the voltage by π/2
When A.C current passes through a capacitor then the current relationship will be_______________?
When A.C current passes through a capacitor then the current relationship will be_______________?
A. The current lead voltage by phase angle is 90 degrees
B. The voltage leads current by phase angle is 90 degrees
C. The current lead voltage by phase angle is 45 degrees
D. The voltage leads current by phase angle is 45 degrees