Advertisements
Advertisements
प्रश्न
Two electric lamps each rating 100 W, 110 V are connected in series to a 220 V power supply and two other electric lamps each of marking 100 W, 220 V are connected in parallel to the same power supply. Will anyone of the two combinations give more light than the other? Give a reason for your answer.
Advertisements
उत्तर
Both combinations will give the same light.
Reason: Each combination has the same power namely 200 W.
संबंधित प्रश्न
What is the meaning of the symbol kWh? Which quantity does it represent?
The SI unit of energy is :
(a) joule
(b) coulomb
(c) watt
(d) ohm-metre
Name the S.I unit of electrical energy. How is it related to Wh?
A servo voltage stabiliser restricts the voltage output to 220 V ± 1%. If an electric bulb rated at 220 V, 100 W is connected to it, what will be the minimum and maximum power consumed by it?
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?
Define electric power. An electrical device of resistance R is connected across a source of voltage V and draws a current I. Derive an expression for power in terms of current and resistance.
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.
Of the three connecting wires in a household circuit: Which two of the three wires are at the same potential? In which of the three wires should the switch be connected?
What is ‘Rating’ of an electric appliance?
An electric heater is rated 220 V, 550 W. What does this statement mean?
