Advertisements
Advertisements
प्रश्न
Give two precautious that you would take while putting off an electric switch.
Advertisements
उत्तर
We will make sure that no naked wire is touching the button of the switch and neither the hand nor the switch is wet.
संबंधित प्रश्न
Define watt. Write down an equation linking watts, volts and amperes.
In a house two 60 W electric bulbs are lighted for 4 hours, and three 100 W bulbs for 5 hours everyday. Calculate the electric consumed in 30 days.
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?
Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?
Two lamps, one rated 220 V, 50 W and the other rated 220 V, 100 W, are connected in serieswith mains of 220 V. Explain why does the 50 W lamp consume more power
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 electric power? State and define its S.I. unit.
The electric bulbs used these days have a coil-coiled filament. State its reason.
Using a long extension cord in which each conductor has a resistance of 8Ω, a bulb marked as '100 W, 200 V' is connected to a 220 V dc supply of negligible internal resistance as shown in the figure. The power delivered to the bulb is ______ W.
