Please select a subject first
Advertisements
Advertisements
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
Advertisements
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
What is the order of current drawn by appliances connected to the ‘power circuit’ of a household?
Concept: undefined >> undefined
Give two precautious that you would take while putting off an electric switch.
Concept: undefined >> undefined
What is the function of the split rings in a d.c. motor?
Concept: undefined >> undefined
Why is the electric power from the generating station transmitted at high voltage?
Concept: undefined >> undefined
How does the heat produced by die passage of current in a metallic wire depend on the current in the wire?
Concept: undefined >> undefined
How does the heat produced by die passage of current in a metallic wire depend on the resistance of the wire.
Concept: undefined >> undefined
How does the heat produced by die passage of current in a metallic wire depend on the time of passage of current in the wire?
Concept: undefined >> undefined
What do you understand by ‘earthing’? What are the advantages of earthing in a household electric circuit? Explain, how it is done?
Concept: undefined >> undefined
State relative advantages and disadvantages of ring system of wiring over the tree system.
Concept: undefined >> undefined
An electric heater is rated 220 V, 550 W. What does this statement mean?
Concept: undefined >> undefined
An electric heater is rated 220 V, 550 W. Calculate the electrical energy consumed in 3 hours?
Concept: undefined >> undefined
An electric heater is rated 220 V, 550 W. Electrical energy is also measured in kWh. What do you understand by a kilo-watt-hour?
Concept: undefined >> undefined
State the reason why, in a three-pin plug, the earth pin is longer and thicker than the other two.
Concept: undefined >> undefined
