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What is consumed while using different electrical appliances, for which electricity bills are paid?
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How do kilowatt and kilowatt-hour differ?
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How do kilowatt and kilowatt-hour differ?
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List the names of three electrical gadgets used in your house. Write their power, voltage rating and approximate time for which each one is used in a day. Hence find the electrical energy consumed by each in a month of 30 days.
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List the names of three electrical gadgets used in your house. Write their power, voltage rating and approximate time for which each one is used in a day. Hence find the electrical energy consumed by each in a month of 30 days.
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When a current I flows through a resistance R for time t, the electrical energy spent is given by ______.
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When a current I flows through a resistance R for time t, the electrical energy spent is given by ______.
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An electric toaster draws current 8 A in a circuit with source of voltage 220 V. It is used for 2 h. Find the cost of operating the toaster if the cost of electrical energy is ₹ 4.50 per kWh.
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An electric toaster draws current 8 A in a circuit with source of voltage 220 V. It is used for 2 h. Find the cost of operating the toaster if the cost of electrical energy is ₹ 4.50 per kWh.
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State three actions that a total reflecting prism can produce.
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Give any two important sources of background radiation.
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What is mean by background radiation?
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- Define pitch.
- Two wires AB and CD of same length are stretched by same amount. Which wire will produce a sound of greater pitch on plucking?
- Give a reason for your answer.
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Name one internal source of background radiations.
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Complete the path of ray PQ through the glass prism ABC shown in Fig. till it emerges out of the prism. Given the critical angle of the glass is 42°.
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Name the physical quantity which is measured in kWh.
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Name the physical quantity which is measured in kWh.
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Name the physical quantity which is measured in Wh.
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Name the physical quantity which is measured in Wh.
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A bulb of power 60 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
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