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प्रश्न
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उत्तर
Given power P = 3k W = 3000 W, Voltage = 250 V
We know that, P =VI
`"I" = "P"/"V" = 3000/250 = 12 "A"`
Thus am aximum of 12 A current can pass through the electric wire
and a fuse of rating 13 A should be used with it
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संबंधित प्रश्न
What does an electric circuit mean?
Three 2 V cells are connected in series and used as a battery in a circuit.
What is the p.d. at the terminals of the battery?
If the amount of electric charge passing through a conductor in 10 minutes is 300 C, the current flowing is:
(a) 30 A
(b) 0.3 A
(c) 0.5 A
(d) 5 A
Draw a circuit diagram to show how two 4 V electric lamps can be lit brightly from two 2 V cells.
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.
If the potential differences between two parts of a thundercloud is 10s V,
what is the amount of energy given up during the passage of 20 coulombs?
(a)2x10-7J
(b)200J
(c)Sx106 j
(d)2x 109J
(e)2x 1010 J
Answer the following question.
An electric lamp of resistance 20 Ω and a conductor of resistance 4 0 are connected to a 6 V battery as shown in the circuit. Calculate: 
(a) the total resistance of the circuit,
(b) the current through the circuit,
(c) the potential difference across the (i) electric lamp and (ii) conductor, and
(d) power of the lamp.
MCB is used to protect household electrical appliances.
