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प्रश्न
In parallel combination of resistances ______.
पर्याय
p.d. is same across each resistance
total resistance is increased
current is same in each resistance
all of the above are true
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उत्तर
In parallel combination of resistances p.d. is same across each resistance.
Explanation:
In parallel combination, the ends of each resistor are connected to the ends of the same source of potential. Thus, the potential difference across each resistance is same and is equal to the potential difference across the terminals of the source (or battery).
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संबंधित प्रश्न
Complete the following :-
(c)
What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?
Calculate the equivalent resistance between the points A and B in Fig. if each resistance is 2·0 Ω.
What are the advantages of a parallel connection?
Explain, why is the p.d. between the terminals of a storage battery less when it is supplying current than when it is on open circuit. A battery of e.m.f. 10 volts and internal resistance 2.5 ohms has two resistances of 50 ohms each connected to it. Calculate the power dissipated in each resistance
(a) When they are in series,
(b) When they are in parallel.
In each case calculate the power dissipated in the battery.
The circuit diagram Fig shows three resistors 2 Ω, 4 Ω and R Ω connected to a battery of e.m.f. 2 V and internal resistance 3 Ω. If main current of 0.25 A flows through the circuit, find:
- the p.d. across the 4 Ω resistor,
- the p.d. across the internal resistance of the cell,
- the p.d. across the R Ω or 2 Ω resistors
- the value of R.
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What connection is used in domestic appliances and why?
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- What is the mode of connection to all the spaces in the house from the mains?
- The spaces 5 and 4 have the same resistance and spaces 3 and 2 have respective resistances of 20Ω and 30Ω. Space 1 has a resistance double that of space 5. What is the net resistance for space 5.
- What is the current in space 3?
- What should be placed between the main connection and the rest of the house’s electrical appliances to save them from accidental high electric current?
