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प्रश्न
What changes in energy occur in an electric bulb?
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उत्तर
In an electric bulb, electrical energy changes to heat and light energy.
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संबंधित प्रश्न
A bulb is rated as 250 V; 0.4 A. Find its : (i) power, and (ii) resistance.
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?
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. Express the power P in terms of current and resistance explaining the meaning of symbols used there in.
Two resistors A and B of 4 Ω and 6 Ω, respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate the power dissipated in each resistor.
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What is the commercial unit of electrical energy? Represent it in terms of joules.
