Advertisements
Advertisements
प्रश्न
Why is a concave reflector placed behind the heating element in a room heater.
Advertisements
उत्तर
The concave reflector, reflects the heat radiations in the forward direction. Thus, large amount of heat radiations are available in one particular direction.
संबंधित प्रश्न
What determines the rate at which energy is delivered by a current?
Name two safety devices which are connected to the live wire of a household electric circuit
Name the quantity whose unit is kilowatt?
An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate:
(a) the power of the kettle.
(b) the energy transferred in 1 minute.
The SI unit of energy is :
(a) joule
(b) coulomb
(c) watt
(d) ohm-metre
A current passes through a resistor. Let K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions, respectively.
An immersion heater rated 1000 W, 220 V is used to heat 0.01 m3 of water. Assuming that the power is supplied at 220 V and 60% of the power supplied is used to heat the water, how long will it take to increase the temperature of the water from 15°C to 40°C?
State the S.I. units of electrical power and electrical energy.
(i) Define the household unit of electricity.
(ii) What is the voltage of the electricity that is generally supplied to a house?
How does the heat produced by die passage of current in a metallic wire depend on the current in the wire?
1 kWh is equal to:
