One day the meter reading is found to be 7643 units while next day, it was 7657 units. What is the consumption of electricity in a day ?
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Give two examples of substances which are good conductors of electricity. Why do you think they are good conductors of electricity ?
Solution : (a) Silver and copper are good conductors of electricity because they have free electrons available for conduction.
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(a) Explain why, ionic compounds conduct electricity in solution whereas covalent compounds do not conduct electricity .
(a) Ionic compounds conduct electricity in solution because they are made up of electrically charged ions but covalent compounds are made u p of electrically neutral molecules so they do...
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A lady bought a new iron container and kept blue vitriol solution into it. On the next day, she found that the container becomes porous
(i) Because iron being more reactive displaces copper from copper sulphate solution by itself and form green coloured ferrous sulphate. (ii) Qualities exhibited by Mohan pre-scientific knowledge, awareness, helpfulness etc.
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(i) State and define the household unit of electricity. (ii) What is the voltage of the electricity
(i) The household unit of electricity is kilowatt-hour (kWh). One kilowatt-hour (kWh) is the electrical energy consumed by an electrical appliance of power 1 kW when it is used for...
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The purpose of an electric meter in a house is 1. to give the cost of electricity directly
The purpose of an electric meter in a house is to give the consumption of electrical energy.
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How can you check just by seeing the meter whether the electricity is in use or not ?
If the electricity is in use, the counter fixed on the armature of the meter rotates and reads the number of rotations (A red mark is seen rotating).
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Assuming the electric consumption per day to be 12 kWh and the rate of electricity to be ?
Electric energy consumed per day = 12 kWh = 12 units Electric energy consumed in 30 days = 12 × 30 = 360 units Cost to be paid in 1 month =...
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The distance of P(3,4) from the x-axis is (a) 3 units (b) 4 units (c) 5 units (d) 1 unit
(b) 4 units The y-coordinate the distance of the point from the x-axis Here, the y-coordinate is 4.
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We should not touch the switch with wet hands otherwise 1. electricity may pass through our body 2. electricity may not pass through the appliance
1. electricity may pass through our body
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State two change that you can make in your habits to reduce the consumption of electricity or water.
We can be eco-friendly by: (i) Using the principal of 3 R's i.e., Reduce, Reuse and Recycle. (ii) Putting off unnecessary light and fans (iii) Practice rainwater harvesting.
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