English

If a Bulb of 60w is Connected Across a Source of 220v, Find the Current Drawn by It. - Science and Technology 1

Advertisements
Advertisements

Question

If a bulb of 60W is connected across a source of 220V, find the current drawn by it.

Solution

Power P = 60W, Voltage V = 220. To find eye ?

We have current `I = P/V = 60/220= 0.272 A`

shaalaa.com
  Is there an error in this question or solution?
2017-2018 (March)

APPEARS IN

RELATED QUESTIONS

What determines the rate at which energy is delivered by a current?


Name the quantity whose unit is (i) kilowatt, and (ii) kilowatt-hour.


Which quantity has the unit of watt?


The diagram below shows a circuit containing a lamp L, a voltmeter and an ammeter,. The voltmeter reading 3 V and the ammeter reading is 0.5 A. 

  

 What is the resistance of the lamp?
 What is the power of the lamp?


Define kilowatt-hour. 


List the names of three electrical gadgets used in your house. Write their power, voltage ratingand approximate time for which each one is used in a day. Hence find the electrical energyconsumed by each in a day.


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.


The diagram below shows a magnetic kept just below the conductor AB which is kept in North South direction.

(i) In which direction will the needle deflect when the key is closed ?
(ii) Why is the deflection produced ?
(iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB ?
(iv) Name one device which works on this principle.


What is the role of a key in an electric circuit?

What are the two main systems of wiring commonly used in houses? Which of these systems mentioned by you is better and why?


Point out two main disadvantages of ‘Tree System’.


Name two common material used for heating elements.


What is the function of the split rings in a d.c. motor?


How does earthing prevent electrical shock?


A family uses a light bulb of 100W, a fan of 100W, and a heater of 1000W, each for 8 hours a day. If the cost of electricity is Rs. 2 per unit, what is the expenditure to the family per day, on electricity?


Two bulbs are rated: bulb A 100W, 120 V bulb B 10W, 120 V. If both are connected across a 120V supply, which bulb will consume more energy, When in series? Also calculate the current through each bulb in above cases.


Two bulbs are rated: bulb A 100W, 120 V bulb B 10 W, 120 V. If both are connected across a 120V supply, which bulb will consume more energy, When in parallel? Also calculate the current through each bulb in the above cases.


Unit of electric power may also be expressed as:


1 mV is equal to:


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×