Advertisements
Advertisements
प्रश्न
Which of the following is the most likely temperature of the filament of an electric light bulb when it is working on the normal 220 V supply line?
(a) 500°C
(b) 1500°C
(c) 2500°C
(d) 4500°C
Advertisements
उत्तर
(c) 2500°C
It is the temperature of an electric bulb filament when it glows.
APPEARS IN
संबंधित प्रश्न
Which particles are responsible for current in conductors?
What is the SI unit of (i) electric energy, and (ii) electric power?
An electric fan runs from the 230 V mains. The current flowing through it is 0.4 A. At what rate is electrical energy transferred by the fan?
Write the formula for electric power in terms of potential difference and current.
The unit for expressing electric power is:
(a) volt
(b) joule
(c) coulomb
(d) watt
Write an expression for the electrical power spent in flow of current through a conductor in terms of
(a) Resistance and potential difference, (b) current and resistance.
1Kwh =`( 1 "volt "xx 1 am pere xx.............)/1000`
A geyser is rated 1500 W, 250 V. This geyer is connected to 250 V mains. Calculate:
(i) the current drawn
(ii) the energy consumed in 50 hours, and
(iii) the cost of energy consumed at Rs. 4.20 per kWh
Fig . shows the essent ial features of a battery operated bell. The hammer strikes the gong when the swi tch is closed . State and explain the effect of using the following material successively to form the core.
(a) Plastic
(b) Steel
(c) Copper
What is the energy conversion when an electric current passes through a metallic wire?
Name three main characteristics of an heating element.
Why is heating element wound on a long porcelain rod in a room heater.
Which material is the calorimeter commonly made of? Give one reason for using this material.
At what voltage is the electric power generated at the generating station? Explain the transmission of this power to your house.
How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.
The resistance of filament of an electric heater is 500 Ω It is operated at 200V for 1 hour daily. Calculate the current drawn by the heater and the energy consumed in joule.
Unit of electric power may also be expressed as:
