A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
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In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because
(b) larger amount of potential energy is converted into kinetic energy
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An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?
(d) 5 A rating must be used
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Which of the following terms does not represent electrical power in a circuit?
We know that electric power is given by P = VI … (i) So, the option (c) is correct. According to Ohm’s law, V = IR … (ii) Now putting the value of...
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Name four appliances wherein an electric motor, a rotating device that converts electrical energy to mechanical energy,
Electric fans, mixers, washing machines, computer drives, etc. Motors convert electrical energy into mechanical energy whereas generators convert mechanical energy into electrical energy.
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Nitu presented a silver lamp to her mother on her birthday. The lamp contained 3. 011 × 1023 atoms of silver in it.
Atomic mass of silver (Ag) = 108 u Since mass of 6.022 × 1023 atoms of silver (Ag) = 108 u Hence mass of 3.011 × 1023 atoms of silver (Ag) = 108×3.011×1023/...
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Name the device which converts mechanical energy into electrical energy.
Electric generator.
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Define 1 Watt of power. A lamp consumes 1000 J of electrical energy in 10s. Calculate its power
A body is said to have power of 1 watt if it does work at the rate of 1 joule in 1 s, i.e., 1W=1J/1s Power is given by the expression, Power=Work done...
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Describe how hydro-energy can be converted into electrical energy.
The water from the high level in the dam is carried through pipes to the turbine, at the bottom of the dam. Moving turbine rotates the coils of the dynamo...
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A light source emits monochromatic light of wavelength 555 nm. The source consumes 100 W of electric power
Overall luminous efficiency =Total luminous flux / Power input =35x685/100 = 239.75 lumen/W
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To convert mechanical energy into electrical energy, one can use (a) DC dynamo
(a) (b) To convert mechanical energy into electrical energy, one can use DC dynamo and AC dynamo.
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