मराठी

Unit of electric power may also be expressed as - Science

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प्रश्न

Unit of electric power may also be expressed as

पर्याय

  • volt ampere

  • kilowatt hour

  • watt second

  • joule second

MCQ
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उत्तर

volt ampere

Explanation - 

Power is defined as 

P = VI

where, V = Potential difference (Volt) 

I = Current (Ampere)

So, unit of electric power may also be expressed as volt ampere.

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पाठ 12: Electricity - Multiple Choice Questions [पृष्ठ ९४]

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एनसीईआरटी एक्झांप्लर Science [English] Class 10
पाठ 12 Electricity
Multiple Choice Questions | Q 18. | पृष्ठ ९४

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

1 A = _________ mA

  1. 102
  2. 103
  3. 10-3
  4. 10-6

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 What is the p.d. at the terminals of the battery?


How many milliamperes as there in 1 ampere?


 Write down the formula which relates electric charge, time and electric current


A student made an electric circuit shown here to measure the current through two lamps.

Are the lamps in series or parallel?  

(a) Are the lamps in series or parallel?
(b) The student has made a mistake in this circuit. What is the mistake?
(c) Draw a circuit diagram to show the correct way to connect the circuit. Use the proper circuit symbols in your diagram. 


Ten bulbs are connected in a series circuit to a power supply line. Ten identical bulbs are connected in a parallel circuit to an identical power supply line. 

(b) In which circuit, if one bulbs be brighter?


Which is the better way to connect lights and other electrical appliances in domestic wiring: series circuits or parallel circuits? why?


Name two devices which work on the heating effect of electric current.


What happens to the resistance if the conductor is made thinner?

What is the direction of electric current?

Explain the meaning of the statement 'the current rating of a fuse is 5 A'.

Many electrical appliances and circuits are earthed grounded. What is the reason for this?

Find the effective resistance in the following circuit diagrams (Fig.):


Find the effective resistance in the following circuit diagrams (Fig.):


An electric oven is rated as 1.5 kW, 250 V. If it is connected to a 250 V mains, calculate the
(a) Current drawn,
(b) Energy consumed in 20 hours,
(c) Cost of energy consumed in 20 hours at the rate of Re. 1 per unit.


An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at Rs. 5.40 per unit.


What should I choose ___________________

a. for decreasing resistance in a circuit.
(Resistors in series / Resistors in parallel)

b. for getting protection from electric current.
(Nickel / Ebonite)

c. to measure the current in the circuit?
(Ammeter/ Voltmeter) 

Which part of an electrical appliance is earthed?


A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly


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