An arc lamp consumes `10 A` at `40 V`. Calculate the power factor when it is connected with a suitable value of choke coil required to run the arc lamp on `AC` mains of `200 V ("rms")` and `50 Hz`.
Text Solution
Verified by Experts
The correct Answer is:
B
`R=V/I=40/10=4Omega` `Z=V/I=200/10=20Omega` Power factor, `cosphi=R/Z=4/20` `=0.2`
Topper's Solved these Questions
ALTERNATING CURRENT
DC PANDEY|Exercise Level 1 Assertion-Reason|11 Videos
ALTERNATING CURRENT
DC PANDEY|Exercise Level - 1 Objective|30 Videos
ALTERNATING CURRENT
DC PANDEY|Exercise Exercise 28.1|3 Videos
ATOMS
DC PANDEY|Exercise MEDICAL ENTRANCES GALLERY|42 Videos
Similar Questions
Explore conceptually related problems
A 44 mH inductor is connected to 220 V, 50 Hz ac supply. The rms value of the current in the circuit is
An AC flourescent lamp needs 1-A currect at 100 V Calculate the inducatance of the choke required to run the lamp on a 50 Hz -220 V supply.
When an electric lamp is connected to 12V battery, it draws a current of 0.5A. The power of the lamp is:
A 20 watt electric lamp can be operated at a 50 V DC supply . Calculate the value of capacitance of the capacitor required to run the given lamp at 220 V , 50 Hz AC supply .
A 40 micro F capacitor is connected to a 200V, 50 Hz ac supply. Rms value of current in circuit is nearly
An are lamp operates at 80 V, 10 A. Suggest a method to use it with a 240 V d.c. source. Calculate the value of the electric component required for this purpose.
A 20 watt, 50 V lamp is connected in series to a.c. mains of 250 V, 50 Hz. Calculate to value of capacitor to run the lamp.
A 25 W lamp is connected to an ac source of peak emf 100 V. Compute the rms current in the lamp.
A 40Omega electric heater is connected to a 200V, 50Hz main supply. The peak value of electric current flowing in the circuit is approx.
