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What Makes an Electric Current Flow in a Wire?

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प्रश्न

What Makes an Electric Current Flow in a Wire?

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उत्तर

The potential difference between the ends of the wire makes the current flow through the wire.

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अध्याय 1: Electricity - Exercise 2

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लखमीर सिंग Physics (Science) [English] Class 10
अध्याय 1 Electricity
Exercise 2 | Q 17.2

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संबंधित प्रश्न

Draw the electrical symbols of the following components and state its use:

Rheostat (variable resistance)


Which particles constitute the electric current in a metallic conductor?


In 10 s, charge of 25 C leaves a battery, and 200 J of energy are delivered to an outside circuit a result. 

What is the p.d. across the battery?


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?


Consider the circuit given below when A, B and C are three identical light bulbs of constant resistance.   

(a) List the bulbs in order of increasing brightness.
(b) If C burns out, what will be the brightness of A now compared with before?
(c) If B burns out instead, what will be the brightness of A and C compared with before?


Define the term resistivity. 


A cell supplies a current of 1.2 A through two 2 Ω resistors connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate:

(i) the internal resistance and (ii) e.m.f. of the cell. 


Draw a schematic diagram of an electric circuit consisting of a battery of two cells each of 1.5 V, 5 Ω, 10 Ω and 15 Ω resistors and a plug key, all connected in series.


Two resistors of 4 Ω and 6 Ω are connected in parallel. The combination is
connected across a 6 volt battery of negligible resistance. Calculate:
( i) The power supplied by the battery,
(ii) The power dissipated in each resistor.


Name the unit which a consumer pays as the cost of electricity.

Complete the following table. The first answer has been given as an example

Quantity Unit

(a) Electrical potential Volt

( b) Resistance

( c) Power

( d) Energy

( e) Resistivity

Volt

........

..........

............

..............


What would be the danger involved in replacing a blown fuse with the one which would carry a large current?


Fig . shows the core of a transformer and i ts input and output connections 

State the material used for the core and describe th e structure of the core.
(a) Use the values given in the diagram to calculate the turns ratio for the transformer and connections, labeling all parts of the diagram .
(b) If a current of 2 A is taken from th e output, calculate th e current in the input circuit (Assume the transformer to be ideal ).


A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 Ω . A steady current of 0.5 A flows through the circuit. Calculate:

The total energy supplied by the battery in 10 minutes


An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at Rs. 5.40 per unit.


My mother was operating washing machine on Sunday morning. Suddenly, she saw a spark coming out of the electric board and the electric current in the house failed. An electrician was called to look into the matter. What should he have noticed.


State expression for Cells connected in series.


An electric bulb is marked 100 W, 250 V. How much current will the bulb draw if connected to a 250 V supply?


Kilowatt hour is the unit of


When an electric current is passed, electrons move from:


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