Advertisements
Advertisements
प्रश्न
A device is used to transform 12 V a.c. to 200 V a.c. What is the name of this device? Name the principle on which it works.
Advertisements
उत्तर
Step-up transformer. Step-up transformer works on the principle of electromagnetic induction.
संबंधित प्रश्न
State two factors on which the electrical energy consumed by an electrical appliance depends.
Explain why, filament type electric bulbs are not power efficient.
When a current of 4.0 A passes through a certain resistor for 10 minutes, 2.88 × 104 J of heat are produced. Calculate
the power of the resistor.
the voltage across the resistor.
Water in an electric kettle connected to a 220 V supply took 5 minutes to reach its boiling point. How long will it take if the supply voltage falls to 200 V?
Why is heating element wound on a long porcelain rod in a room heater.
An Electric bulb is marked 100 W, 230 V. What current does it take?
A bulb is connected to a battery of e.m.f. 6V and internal resistance 2Ω A steady current of 0.5A flows through the bulb. Calculate the resistance of the bulb.
A consumer uses 4 lamps of 60 watt, 2 lamps of 40 watt, and 2 lamps of 100 watt. All these are used for 6 hour daily. Find the total bill for 30 days when the rate of energy is 75 paise per unit and the meter rent is Rs. 1.
