Advertisements
Advertisements
प्रश्न
What type of transformer is used in a mobile phone charger?
Advertisements
उत्तर
A step-down transformer is used in mobile phone chargers.
APPEARS IN
संबंधित प्रश्न
How much current is drawn by the primary of a transformer connected to 220 V supply when it delivers power to a 110 V − 550 W refrigerator?
Explain the significance of Lenz’s law to show the conservation of energy in electromagnetic induction.
How are the e.m.f in the primary and secondary coils of a transformer related with the number of turns in these coils?
What is a transformer? On what principle does it work?
Applying e.m. f to primary coil is 210 V. If the number of turns in primary coil is 200 turns and that of in secondary coil is 20 turns, then find out the output voltage. Name the type of transformer.
A transformer lowers e.m.f. 220 V to 12 volts. If the number of turns in primary are 8800, how many turns are in secondary coil?
State the mathematical relation between a number of turns in the primary coil to a secondary coil in the step-up transformer.
Assertion: A transfonner cannot work on D.C. supply.
Reason: D.C. changes neither in magnitude nor in direction.
The line that draws power supply to your house from street has ______.
- zero average current.
- 220 V average voltage.
- voltage and current out of phase by 90°.
- voltage and current possibly differing in phase `phi` such that `|phi| < pi/2`.
