मराठी

Name the device used these days in place of electric fuses in electrical circuits.

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प्रश्न

Name the device used these days in place of electric fuses in electrical circuits.

एका वाक्यात उत्तर
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उत्तर

Miniature circuit breaker (MCB) is used these days in place of electric fuses in electrical circuits.

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पाठ 14: Electric Current and Its Effects - VERY SHORT ANSWER QUESTIONS [पृष्ठ ७७]

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एनसीईआरटी एक्झांप्लर Science [English] Class 7
पाठ 14 Electric Current and Its Effects
VERY SHORT ANSWER QUESTIONS | Q 7. | पृष्ठ ७७

संबंधित प्रश्‍न

Redraw the circuit of question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the 12 Ω resistors. What would be the readings in the ammeter and the voltmeter?


The accompanying figure shows some electrical appliances connected in a circuit in a house. Answer the following questions.

  1. By which method are the appliances connected?
  2. What must be the potential difference across individual appliances?
  3. Will the current passing through each appliance be the same? Justify your answer.
  4. Why are the domestic appliances connected in this way?
  5. If the T.V. stops working, will the other appliances also stop working? Explain your answer.

In any electric circuit, when the switch is on and the current flows through it why do the wire, switches, bulb or devices become hot?


If you touch an electric wire carrying current you get a shock, but if on the same wire the birds sit they do not get any shock/current. Explain why?


Increasing the current passing through the wire decreases the magnetic field intensity.


Study the three electric circuits below. Each of them has a glass rod (G), a steel rod (S), and a wooden rod (W).

In which of the electric circuits would the bulb not light up.


Write a short note on the different electrical circuits.


Name the device which is used to measure the strength of the electric current in an electric circuit.


An electric motor rated 1100 W is connected to 220 V mains. Find: 

  1. The current drawn from the mains,
  2. Electric energy consumed if the motor is used for 5 hours daily for 6 days.
  3. Total cost of energy consumed if the rate of one unit is 5.

How is Joule's law effect useful in electric circuits where fuse is used as a safety device?


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