Power transmission is the bulk transfer of electric power from one place to another. A power transmission system in a country is referred to as the national grid. This transmission grid is a network of power generating stations, transmission circuits and sub-stations. It is usually transmitted in three phase alternating current.
Mutiso answered the question on October 16, 2018 at 11:31
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Outline uses of transformers
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Outline uses of transformers.
Date posted:
October 16, 2018
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A step-up transformer has 10,000 turns in the secondary coil and 100 turns in the primary coil. An alternating current of 0.5 A flows in...
(Solved)
A step-up transformer has 10,000 turns in the secondary coil and 100 turns in the primary coil. An alternating current of 0.5 A flows in the primary circuit when connected to a 12.0 V a.c. supply.
(a) Calculate the voltage across the secondary coil (b) If the transformer has an efficiency of 90%, what is the current in the secondary coil?
Date posted:
October 16, 2018
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A current of 0.6 A is passed through a step up transformer with a primary coil of 200 turns and a current of 0.1 A...
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A current of 0.6 A is passed through a step up transformer with a primary coil of 200 turns and a current of 0.1 A is obtained in the secondary coil. Determine the number of turns in the secondary coil and the voltage across if the primary coil is connected to a 240 V mains.
Date posted:
October 16, 2018
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What are the applications of mutual induction?
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What are the applications of mutual induction?
Date posted:
October 16, 2018
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How does mutual induction occur?
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How does mutual induction occur?
Date posted:
October 16, 2018
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Factors affecting the magnitude of the induced induced electromagnetic force (e.m.f)
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Factors affecting the magnitude of the induced induced electromagnetic force (e.m.f)
Date posted:
October 16, 2018
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Answers (1)
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Describe an experiment to show that e.m.f is induced due to the relative motion of the wire or the magnet.
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Describe an experiment on electromagnetic induction to show that e.m.f is induced due to the relative motion of the wire or the magnet.
Date posted:
October 16, 2018
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Explain unique properties of electromagnetic waves
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Explain unique properties of electromagnetic waves.
Date posted:
October 16, 2018
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A VHF radio transmitter broadcasts radio waves at a frequency of 30 M Hz. What is their wavelength?
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A VHF radio transmitter broadcasts radio waves at a frequency of 30 M Hz. What is their wavelength?
Date posted:
October 16, 2018
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Answers (1)
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What is electromagnetic spectrum?
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What is electromagnetic spectrum?
Date posted:
October 16, 2018
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Answers (1)
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A material of density 8.5 gcm-3 is attached to a piece of wood of mass 100g and density 0.2 gcm-3. Calculate the volume of material...
(Solved)
A material of density 8.5 gcm-3 is attached to a piece of wood of mass 100g and density 0.2 gcm-3. Calculate the volume of material X which must be attached to the piece of wood so that the two just submerge beneath a liquid of density 1.2 gcm-3.
Date posted:
October 16, 2018
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Answers (1)
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A balloon made up of a fabric weighing 80 N has a volume of 1.0 × 107 cm. the balloon is filled with hydrogen of...
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A balloon made up of a fabric weighing 80 N has a volume of 1.0 × 107 cm. the balloon is filled with hydrogen of density 0.9 kgm-3. Calculate the greatest weight in addition to that of the hydrogen and the fabric, which the balloon can carry in air of average density 1.25 kgm-3
Date posted:
October 16, 2018
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Answers (1)
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A solid of mass 1.0 kg is suspended using a thread and then submerged in water. If the tension on the thread is 5.0 N,...
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A solid of mass 1.0 kg is suspended using a thread and then submerged in water. If the tension on the thread is 5.0 N, determine the relative density of the solid.
Date posted:
October 16, 2018
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Answers (1)
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Applications of Archimedes principle and relative density
(Solved)
Applications of Archimedes principle and relative density
Date posted:
October 16, 2018
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Answers (1)
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Describe experiment to determine the relative density of a cork
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Describe experiment to determine the relative density of a cork
Date posted:
October 16, 2018
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Answers (1)
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A wooden block of dimensions 3 cm × 3 cm × 4 cm floats vertically in methylated spirit with 4 cm of its length in...
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A wooden block of dimensions 3 cm × 3 cm × 4 cm floats vertically in methylated spirit with 4 cm of its length in the spirit. Calculate the weight of the block. (Density of methylated spirit = 8.0 × 102 kgm-3)
Date posted:
October 16, 2018
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Answers (1)
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Describe experiment to demonstrate the law of flotation
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Describe experiment to demonstrate the law of flotation
Date posted:
October 16, 2018
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A block of metal of volume 60 cm3 weighs 4.80 N in air. Determine its weight when fully submerged in a liquid of density 1,200...
(Solved)
A block of metal of volume 60 cm3 weighs 4.80 N in air. Determine its weight when fully submerged in a liquid of density 1,200 kgm-3.
Date posted:
October 16, 2018
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Answers (1)
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Describe an experiment to demonstrate Archimedes principle
(Solved)
Describe an experiment to demonstrate Archimedes principle
Date posted:
October 16, 2018
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Describe the applications of centripetal force
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Describe the applications of centripetal force.
Date posted:
October 16, 2018
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