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प्रश्न
Electrical power P is given by the expression P = (Q × V) ÷ time
(a) What do the symbols Q and V represent?
(b) Express the power P in terms of current and resistance explaining the meanings of symbols used there in.
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उत्तर
(a) Q represents Charge and V represents Voltage.
(b) Electrical Power , P = I2R
where I : Current
and R : Resistance
संबंधित प्रश्न
Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V.
(a) Draw a circuit diagram to show the connections.
(b) Calculate the current drawn from the electric supply.
(c) Calculate the total energy consumed by the two lamps together when they operate for one hour.
Name two devices which work on the heating effect of electric current.
Define the term resistivity.
Find the effective resistance in the following circuit diagrams (Fig.):
An electric bulb is marked '100 W, 250 V'. What information does this convey?
Define the following:
Conventional current
