Advertisements
Advertisements
प्रश्न
An electric kettle is rated 3kW, 250V. What should be the current capacity of the fuse with it?
Advertisements
उत्तर
The maximum current capacity of kettle, I = `"P"/"V" = 3000/250 = 12"A"`
Thus, the fuse should be of current capacity slightly less than 12A.
APPEARS IN
संबंधित प्रश्न
A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the resistor will ______________ .
A coil of copper wire is connected to a galvanometer. What would happen if a bar magnet is:
(i) Pushed into the coil with its north pole entering first?
(ii) Held at rest inside the coil?
(iii) Pulled out again?
Define Kilo watt hour.
State three factors on which the heat produced in a metallic wire due to passage of current in it depends.
What changes in energy occur in an electric heater?
An electric bulb is marked 100 W, 230 V. What does this mean?
Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the resistance of each heater.
Out of the three fuses with current ratings 5A, 10A, 15A, which one is to be connected in a geyser circuit marked 3 kW, 220V? Give reason for your answer.
A bulb is marked 100W, 220V and an electric heater is marked 2000 W, 220 V.
(i) What is the ratio between the resistances of these two devices?
(ii) How does the power-voltage rating of a device help us to decide about the type of leads (connecting wires) to be used for it?
(iii) In which of the above two devices, a thicker connecting wire of lead is required?
A cooler of 1500 W, 200 volts and a fan of 500 W, 200 volts are to be used from a household supply. The rating of fuse to be used is:
