Advertisements
Advertisements
Household wiring for lamp connections can either be done in parallel or in series.Which one would you prefer? Give a reason for your answer.
Concept: undefined >> undefined
Why is the heating element of an electric oven wound on a helix? State the reason.
Concept: undefined >> undefined
Advertisements
The electric bulbs used these days have a coil-coiled filament. State its reason.
Concept: undefined >> undefined
What changes in energy occur in an electric bulb?
Concept: undefined >> undefined
What changes in energy occur in an electric heater?
Concept: undefined >> undefined
An electric filament lamp is connected to a supply of voltage higher than the recommended value. Give reasons, why compared with a normal performance, the lamp emits a brighter light and its life is shortened.
Concept: undefined >> undefined
‘The current rating of a fuse is 5A’. Comment on this statement.
Concept: undefined >> undefined
Two lamps are rated 220V, 50W and the other rated 220V, 100W are connected in series with the mains of 220 V. Explain, why the 50W lamp glows more?
Concept: undefined >> undefined
Why does not the heating coil produce any visible light? in an electric stove.
Concept: undefined >> undefined
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?
Concept: undefined >> undefined
State two advantages of filling an inert gas in an evacuated electric filament lamp.
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
Which material is the calorimeter commonly made of? Give one reason for using this material.
Concept: undefined >> undefined
Name a metal that is used as an electron emitter. Give one reason for using this metal.
Concept: undefined >> undefined
What is ‘Rating’ of an electric appliance?
Concept: undefined >> undefined
If the rating of an electric bulb is 100W – 230V, Explain its meaning.
Concept: undefined >> undefined
What would happen and why, to an electric bulb when it is connected across a supply of voltage (i) lower (ii) higher than its proper rating?
Concept: undefined >> undefined
An electric bulb is marked 100 W, 230 V. What does this mean?
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
What is the order of current drawn by appliances connected to the ‘light circuit’ of a household?
Concept: undefined >> undefined
