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What determines the rate at which energy is delivered by a current? - Science

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प्रश्न

What determines the rate at which energy is delivered by a current?

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उत्तर

The rate of consumption of electric energy in an electric appliance is called electric power. Hence, the rate at which energy is delivered by a current is the power of the appliance.

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पाठ 12: Electricity - Intext Questions [पृष्ठ २२०]

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एनसीईआरटी Science [English] Class 10
पाठ 12 Electricity
Intext Questions | Q 1 | पृष्ठ २२०

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संबंधित प्रश्‍न

Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?


Which quantity has the unit of watt?


Which of the following is likely to be the correct wattage for an electric iron used in our homes? 

(a) 60 W
(b) 250 W
(c) 850 W
(d) 2000 W


The SI unit of energy is :

(a) joule
(b) coulomb
(c) watt
(d) ohm-metre


Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?


An electric toaster draws 8 A current in a 220 V circuit. It is used for 2 h. Find the cost of
operating the toaster if the cost of electrical energy is Rs. 4.50 per kWh.


An electric bulb marked 220 V, 100 W will get fused if it is made to consume 150 W or more. What voltage fluctuation will the bulb withstand?


Name any four components of an electric circuit. Write their symbols also.

Define electric power. What do you mean by 'power rating' of an electric appliance?

What is the frequency of D.C.?

A dynamo converts one from of energy into another. Name the two forms of energy.

Name three main characteristics of an heating element.


State two advantages of filling an inert gas in an evacuated electric filament lamp.


State relative advantages and disadvantages of ring system of wiring over the tree system.


How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.


With reference to the diagram shown below calculate:

(i) The equivalent resistance between P and Q.
(ii) The reading of ammeter.
(iii) The electrical power between P and Q.


An electric bulb is rated as 100W – 250V. What information does it convey? Calculate the resistance of its filament while glowing.


A cooler of 1500 W, 200 volts and a fan of 500 W, 200 volts are to be used from a household supply. The rating of fuse to be used is:


A room has AC run for 5 hours a day at a voltage of 220V. The wiring of the room consists of Cu of 1 mm radius and a length of 10 m. Power consumption per day is 10 commercial units. What fraction of it goes in the joule heating in wires? What would happen if the wiring is made of aluminium of the same dimensions?

`[ρ_(Cu) = 1.7 xx 10_(Ωm)^-8, ρ_(Al) = 2.7 xx 10^-8 Ωm]`


A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V Write Yes or No. Give supporting calculations to justify your answer.


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