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प्रश्न
What is ‘Rating’ of an electric appliance?
उत्तर
Rating of an electric appliance indicates energy consumed per second or watt when connected to a supply of given voltage.
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संबंधित प्रश्न
Calculate the cost of operating a heater of 500 W for 20 hours at the rate of Rs 3.90 per unit.
The SI unit of energy is :
(a) joule
(b) coulomb
(c) watt
(d) ohm-metre
The commercial unit of energy is :
(a) watt
(b) watt-hour
(c) kilowatt-hour
(d) kilo-joule
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(a) 2 A
(b) 5 A
(c) 10 A
(d) 15 A
Electrical power p is given by the expression P = (Q × V) ÷ time. Express the power P in terms of current and resistance explaining the meaning of symbols used there in.
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
An electric bulb is rated ‘100 W, 250 V’. How much current will the bulb draw if connected to a 250 V supply?
Which cable, one rated 15A and the other rated 5A will be thicker? Give a reason.
Mention three uses of the carbon arc.
How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.
