Advertisements
Advertisements
प्रश्न
Why does not the heating coil produce any visible light? in an electric stove.
Advertisements
उत्तर
It is because, the temperature of heating element is around 1000°C, whereas visible light is produced if the temperature rises above 1500°C.
संबंधित प्रश्न
1 calorie = _________ joule.
If a bulb of 60W is connected across a source of 220V, find the current drawn by it.
An electric bulb is rated at 220 V, 100 W. What is its resistance?
Two resistors A and B of 4 Ω and 6 Ω respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate the power supplied by the battery.
In an electric radiator or room heater, state with reason, why the porcelain tube wound with a nichrome wire is placed between the pole and principal focus of the parabolic concave reflector.
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.
An electric bulb is rated 240V-60W and is working at 100% efficiency.
(i) Calculate the resistance of bulb.
(ii) (a) Draw the circuit diagram.
(b) What is the rate of conversion of energy in each bulb?
(c) Total power used by the bulbs.
I ampere of current is passed through a resistor of resistance R ohm for time t second. Obtain expression for
(i) the electrical energy, and
(ii) the electrical power spent.
An Electric bulb is marked 100 W, 230 V. What how long would this lamp take to consume one unit of electricity?
