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The lamps in a household circuit are con...

The lamps in a household circuit are connected in parallel because:
(a) this way they require less current
(b) if one lamp fails the others remain lit
(iii) this way they require less power
(d) if one lamp fails the others also fail

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The correct Answer is:
b
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Read the following text and answer the following questions on the basis of the same: Shunt resistance: The ammeter shunt is the device which provides the low resistance path to the flow of current. It is connected in parallel with the ammeter. In some ammeter the shunt is in-built inside the instrument while in others it is externally connected to the circuit. Ammeters are designed for measurement of low current. For measuring high current, the shunt is connected in parallel to the ammeter. The significant portion of the current passes to the shunt because of the low resistance path and little amount of current passes through the ammeter. The shunt is connected in parallel to the ammeter because of which the voltage drops across the meter and shunt remain the same. Thus, the movement of the pointer is not affected by the shunt. Let us consider that the current to be measured is I. The circuit has ammeter and shunt connected parallel to each other. The ammeter is designed for measurement of small current say, I_(m) . The magnitude of the current I passes through the meter is very high, and it will burn the meter. So, for measuring the current I the shunt is required in the circuit. As the shunt connects in parallel with the ammeter, thus the same voltage drops occur between them: I_(Sh)R_(SH)=I_(m)R_(m) :.R_(SH)=I_(m)R_(m)//I_(SH) Shunt current I_(SH)=I-I_(m) So, R_(SH)=I_(m)R_(m)//(I-I_(m)) :.I//I_(m)=1+(R_(m)//R_(SH)) The ratio of the total current to the current required for the movement of the ammeter coil is called the multiplying power of the shunt. :. The multiplying power =m=I//L_(m) R_(SH)=R_(m)//(m-1) The following are the requirements of the shunt. • The resistance of the shunt should remain constant with time. • The temperature of the material-should remain same even though substantial current flows through the circuit. Manganin and Constantan are used for inaking the shunt of DC and AC ammeter respectively. What is multiplying power of the shunt?

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LAKHMIR SINGH & MANJIT KAUR-ELECTRICITY -Exercise
  1. If you were going to connect two light bulbs to one battery, would you...

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  2. (a) Which is the better way to connect lights and other electrical app...

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  3. The lamps in a household circuit are connected in parallel because: ...

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  4. Using the circuit given below, state which of the following statemet i...

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  5. (a) Draw a circuit diagram showing two lamps, one cell and a switch co...

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

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

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

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

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

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

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  12. COMMERCIAL UNIT OF ENERGY

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

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

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  15. Distinguish between kilowatt and kilowatt hour.

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  16. Name the physical quantity whose unit is watt.

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

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

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

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

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