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The p.d. across a lamp is 12 V. How many...

The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when: (a) a charge of 1C passes through it?
(b) a charge of 5C passes through it?
(c) a current of 2A flows through it for 10s?

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The correct Answer is:
(a) 12J (b) 60J (c) 240J
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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. What is a circuit diagram? Draw the labelled diagram of an electric ci...

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  2. If the charge on an electron is 1.6 xx 10^(-19) coulombs, how many ele...

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  3. The p.d. across a lamp is 12 V. How many joules of electrical energy a...

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  4. In 20s, a charge of 25 C leaves a battery, and 200J of energy are deli...

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  5. (a) Define electric current. What is the SI unit of electric current. ...

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  6. The outer name of potential difference is:

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  7. Which statement/statement is/are correct? 1. An ammeter is connected...

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  8. Which unit could be used to measure current?

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  9. If the current through a flood lamp is 5A, what charge passes in 10 se...

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  10. If the amount of electric charge passing through a conductor in 10 min...

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  11. A student made an electric circuit shown here to measure the current t...

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  12. Draw a circuit diagram to show how 3 bulbs can be lit from a battery s...

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  13. An electric heater is connected to the 230V mains supply. A current of...

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  14. How many electrons are flowing per second past a point in a circuit in...

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  15. Name the law which relates the current in a conductor to the potential...

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  16. What do you mean by electrical resistance ? How does it arise ? Give i...

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  17. Name the physical quantity whose unti is ''ohm''.

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  18. The substance having infinitely high electrical resistance is called:

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  19. Keeping the resistance constant, the potential difference applied acro...

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  20. State the factors on which the strength of electric current flowing in...

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