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A p.d. of 10V is needed to make a curren...

A p.d. of 10V is needed to make a current of 0.02A flow through a wire. What p.d. is needed to make a current of 250mA flow through the same wire?

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The correct Answer is:
125V
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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. Name the electrical property of a material whose symbol is ''omega''.

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  2. The graph between V and I for a conductor is a straight line passing t...

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  3. A p.d. of 10V is needed to make a current of 0.02A flow through a wire...

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  4. A current of 200mA flows through a 4k Omega resistor. What is the p.d....

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  5. What happens to the resistance as the conductor is made thicker?

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  6. If the length of a wire is doubled by taking more of wire, what happen...

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

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  8. Name the material which is the best conductor of electricity.

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  9. Which among iron and mercury is a better conductor of electricity?

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  10. Why are copper and aluminium wires usually used for electricity transm...

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  11. Name the material which is used for making the heating element of an e...

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  12. What is nichrome? State its one use.

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  13. Why is nichrome used as a heating element ?

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

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  15. Which has more resistance: (a) a long piece of nichrome wire or shor...

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  16. (a) How does the resistance of a pure metal change if its temperature ...

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  17. Fill in the following blanks with suitable words: Resistance is meas...

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  18. (a) What do you understand by the ''resistivity'' of a substance? (b...

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  19. (a) Write down an expression for the resistance of a metallic wire in ...

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  20. (a) Give two examples of substances which are good conductors of elect...

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