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Define the unit of current....

Define the unit of current.

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The SI unit of electric current is ampere (which is denoted by the letter A). When 1 coulomb of charge flows through any cross-section of a conductor in 1 seccond, the current flowing through it is said to be 1 ampere.
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Name and define the SI unit of current.

Derive an expression for the force between two long parallel current carrying conductors. Use this expression to define SI unit of current.

Define SI unit of current in terms of the force between two parallel current carrying conductors. (b) Two long straight parallel conductors carrying steady currents I_(a)andI_(b) along the same direction are separated by a distance d. How does one explain the force of attraction between them ? If a third conductor carrying a current I_(c) in the opposite direction is placed just in the middle of these conductors , find the resultant force acting on the third conductor.

(a) Define the unit of resistance (or Define the unit ''ohm''). (b) What happens to the resistance as the conductor is made thinner? (c) Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current change?

(a) What is an electric current? What makes an electric current flow in a wire? (b) Define the unit of electric current (or Define ampere).

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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. Which electric heating devices in your home do you think have resistor...

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  2. What does an electric circuit mean ?

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  3. Define the unit of current.

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  4. Calculate the number of electrons consituting one coulomb of charge.

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  5. Name a device that helps to maintain a potential difference across a c...

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  6. What is meant by saying that the potential difference between two poin...

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  7. How much energy is given to each coulomb of charge passing through a 6...

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  8. On what factors does the resistance of a conductor depend ?

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  9. Will current flow more easily through a thick wire or a thin wire of t...

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  10. Let the resistance of an electrical component remain constant while th...

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  11. Why are coils of electric toasters and electric irons made of an alloy...

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  12. Draw a schematic diagram of a circuit consisting of a battery of three...

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  13. Judge the equivalent resistance when the following are connected in pa...

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  14. An electric lamp of 100 Omega, a toaster of resistance 50 Omega and a ...

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  15. What are the advantages of connecting electrical devices in parallel w...

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  16. How can three resistors of resistances 2 Omega,3 Omega, and 6 Omega be...

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  17. What is : (a) the highest (b) the lowest total resistances that can b...

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  18. Why does the cord of an electric heater not glow while the heating ele...

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  19. Compute the heat generated while transferring 96000 coulombs of charge...

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  20. An electric iron of resistance 20 Omega takes a current of 5 A. Calcul...

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