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How Does the Heat H Produced by a Current Passing Through a Fixed Resistance Wire Depend on Magnitude of Current I? - Science

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प्रश्न

How does the heat H produced by a current passing through a fixed resistance wire depend on magnitude of current I?

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उत्तर

Heat produced by a current passing through a wire with a fixed resistance depends on the square of current, I.
Heat, H = I2 x R x t

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Electricity - Exercise 8

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संबंधित प्रश्‍न

A flash of lighting carries 10 C of charge which flows for 0.01 s. What is the current? If the voltage is 10 MV, what is the energy?


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A 5 V battery is connected to two 20 Ω resistors which are joined together in series.

(a) Draw a circuit diagram to represent this. Add an arrow to indicate the direction of conventional current flow in the circuit.
(b) What is the effective resistance of the two resistors?
(c) Calculate the current that flows from the battery?
(d) What is the p.d. across each resistor?


Give three reasons why different electrical appliances in a domestic circuit are connected in parallel.


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(b) In which circuit, if one bulbs be brighter?


 An electrician has wired a house in such a way that if a lamp gets fused in one room of the house, all the lamps in other rooms of the house stop working. What is the defect in the wiring?


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. 

 


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(a) Live wire (b) neutral wire
(c) earth wire (d) either earth or neutral wire


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A battery of e.m.f. 15 V and internal resistance 3 ohm is connected to two resistors of resistance 3 ohm and 6 ohm in series. Find:
(i) The current through the battery,
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Complete the following sentence:

A fuse is connected in ........... with the .........  wire.


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The outer casing of an electric iron is generally connected to earth in order
to


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(a) P.d. across the resistor,
(b) Resistance of the resistor, and
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galvanometer as shown in fig . The galvanometer shows a deflection to the left when the current in the coil as seen from above is counter clockwise. Which one of the following shows the correct deflection of the galvanometer when the magnet is at posi tions A, Band C.


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a. for decreasing resistance in a circuit.
(Resistors in series / Resistors in parallel)

b. for getting protection from electric current.
(Nickel / Ebonite)

c. to measure the current in the circuit?
(Ammeter/ Voltmeter) 

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      (i) Current in 12 Ω resistor.
      (ii) The difference in the readings of A1 and A2, if any.


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