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Consider the circuit given below where A...

Consider the circuit given below where 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?

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The correct Answer is:
(a) A and B are the same; C is brighter (b) The same (c) A goes out; C remains the same
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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
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  2. (a) Draw a circuit diagram showing two lamps, one cell and a switch co...

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  3. Consider the circuit given below where A,B and C are three identical l...

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  4. How do you think the brightness of two lamps arranged in parallel comp...

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  5. If current flows through two lamps arranged: (a) in series, (b) in...

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  6. The figure below shows a variable resistor in a dimmer switch. Ho...

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  7. State two factors on which the electrical energy consumed by an electr...

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  8. Which one has a higher electrical resistance: a 100 watt bulb or a 60 ...

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  9. COMMERCIAL UNIT OF ENERGY

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  10. An electric bulb is rated at 220V, 100W. What is its resistance?

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  11. What is the SI unit of (i) electric energy, and (ii) electric power?

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  12. Distinguish between kilowatt and kilowatt hour.

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  13. Name the physical quantity whose unit is watt.

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  14. What is the meaning of the symbol kWh? Which quantity does it represen...

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  15. If the potential difference between the end of a wire of mixed resista...

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  16. An electric lamp is labelled 12V, 36W. This indicates that it should b...

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  17. What current will be taken by a 920 W appliance if the supply voltage ...

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  18. Define watt. Write down an equation linking watts, volts and amperes.

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  19. Define watt-hour. How many joules are equal to 1 watt-hour?

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  20. How much energy is consumed when a current of 5 amperes flows through ...

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