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A transformer has an efficiency of 80%. It is connected to a power input of 5 kW at 200 V. If the secondary voltage is 250 V, the primary and secondary currents are respectively

1) 25 A, 20 A 2) 20 A, 16A 3) 25 A, 16 A 4) 40 A, 25 A 5) 40 A, 16 A Answer: 3) 25 A, 16 A Solution: Input power = 5 kW = 5000 W... View Article

Sansad TV Perspective: Climate Change and Urban Development

In the series Sansad TV Perspective, we bring you an analysis of the discussion featured on the insightful programme ‘Perspective’ on Sansad TV,... View Article

09 Nov 2021: UPSC Exam Comprehensive News Analysis

Nov 9th, 2021, CNA:- Download PDF Here TABLE OF CONTENTS A. GS 1 Related B. GS 2 Related C. GS 3 Related ENVIRONMENT AND ECOLOGY 1. The long road... View Article

08 Nov 2021: PIB Summary & Analysis

TABLE OF CONTENTS 1. Padma Awards 2. UNESCO Creative Cities Network (UCCN) 3. Statement Delivered by Basic Group in Joint Stocktake Plenary at... View Article

How difficult it is to become an IAS officer?

Becoming an IAS officer is a dream of every aspirant who prepares for the Civil Services Examination conducted by UPSC. But not everyone's dreams... View Article

Bodhisattva – List, Ideal & Definition

The individuals who are on the path to becoming Buddha or attaining salvation are known as Bodhisattvas. In Sanskrit, Bodhisattva means “a person... View Article

Difference Between Small Finance Bank and Payments Bank

The Small Finance Banks and the Payments Banks in India are both licensed under the Reserve Bank of India, and all its guidelines and functioning... View Article

Gadgil Report and Kasturirangan Report on Western Ghats

The frequent occurrence of natural disasters, especially landslides, flooding, have brought into focus the essence of conservation of the... View Article

A torch is not functioning, though contact points in the torch are in working condition. What can be the possible reasons for this? Mention any three.

The possible reasons for not functioning of torch are: The torch bulb may be fused. The cells may be discharged. The cells may not be placed in... View Article

Fig 12.10 A and B, show a bulb connected to a cell in two different ways. (i) What will be the direction of the current through the bulb in both the cases (Q to P or P to Q)? (ii) Will the bulb glow in both the cases? (iii) Does the brightness of the glowing bulb depend on the direction of current through it?

Answer (i) We know that direction of current flow is always from positive terminal of battery to negative terminal through the whole circuit.... View Article

Boojho has a cell and a single piece of connecting wire. Without cutting the wire in two, will he be able to make the bulb glow? Explain with the help of a circuit diagram.

we have to connect the bulb using only one wire. The way to do so is to connect one terminal of the bulb directly to the negative terminal of the... View Article

Paheli wanted to glow a torch bulb using a cell. She could not get connecting wires, instead, she got two strips of aluminium foil. Will she succeed? Explain, how?

Aluminium is a metal and a good conductor of electricity. So yes, the aluminium foils will act as connecting wires of connecting one strip with... View Article

A fused bulb does not glow. Why?

If the filament of a bulb is broken it is said to be a fused bulb that is that the bulb will not glow as the filament is the main glowing part of... View Article

Which of the following arrangement A, B, C and D given in fig 12.9 should not be set up? Explain, why?

(A) is the inappropriate setup. In figure B the electric cell is connected to two bulbs and both bulbs will consume the cell at a very high... View Article

Why do bulbs have two terminals?

A bulb has two terminals, one for sending the current to the filament and the other is for receiving it back. Every electric component has two... View Article

Paheli connected two bulbs to a cell as shown in figure, She found that filament of bulb B is broken. Will the bulb A glow in this circuit? Give reason.

Bulb A will not glow. As we know, if a circuit is not complete the bulb will not glow. The filament is the glowing part of the bulb as well as... View Article

When the chemicals in the electric cell are used up, the electric cell stops producing electricity. The electric cell is then replaced with a new one. In case of rechargeable batteries (such – as the type used in mobile phones, camera and inverters), they are used again and again. How?

Rechargeable batteries can be recharged by providing them the current by secondary cells or storage cells.The main principle of battery is that... View Article

A torch requires 3 cells. Show the arrangement of the cells, with a diagram, inside the torch so that the bulb glows.

The diagram shown below is correct arrangement to join three electric cell inside the torch so that the bulb glows, The current start from the... View Article

An electric bulb is connected to a cell through a switch as shown in the figure. When the switch is brought in ‘ON’ position, the bulb does not glow. What could be the possible reason/s for it? Mention any two of them.

The two possible reason behind that are: The first possible reason is that may be the filament inside the bulb is broken. Filament is the main... View Article

Will the bulb glow in the circuit shown inthe figure? Explain.

The bulb will not glow because the switch is open that means the circuit is broken. Switch helps to complete or break the circuit as it breaks... View Article

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