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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
The SI unit of charge is volt.
Which of the following equation shows the correct relationship between electrical unit?
1A = 1C/s or 1c= 1A/s
In which of the following cases more electrical energy is consumed per hour?
(i) A current of 1 ampere passed through a resistance of 300 ohms.
(ii) A current of 2 amperes passed through a resistance of 100 ohms.
State the S.I. unit of current.
A bulb marked 12 V, 24 W operates on a 12 volt car battery for 20 minutes. Calculate:
(i) The current flowing through it, and
(ii) The energy liberated.
Find the effective resistance in the following circuit diagrams (Fig.):
State the S.I. units of electrical power.
Calculate the current through a 60 W lamp rated 250 V. If the line voltage falls to 200 V, how is power consumed by the bulb affected?
