High voltage leads to low current hence low power losses
johnmulu answered the question on February 20, 2017 at 05:17
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How many 1000w electric irons could be safely connected to a 240 V main circuit fitted with 13 A fuse?
(Solved)
How many 1000w electric irons could be safely connected to a 240 V main circuit fitted with 13 A fuse?
Date posted:
February 20, 2017
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Answers (1)
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In a transformer, the ratio of primary turns to the secondary turns is 1:10. A. A current 500mA flows through a 200$\Omega$ resistor in the secondary circuit. Assuming that the transformer is 100% efficient, determine;
(Solved)
In a transformer, the ratio of primary turns to the secondary turns is 1:10. A. A current 500mA flows through a 200$\Omega$ resistor in the secondary circuit. Assuming that the transformer is 100% efficient, determine;
(i) The secondary voltage
(ii) The primary voltage;
Date posted:
February 20, 2017
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Answers (1)
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What is meant by the term “electromagnetic induction”?
(Solved)
State what is meant by the term “electromagnetic induction”.
Date posted:
February 20, 2017
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Answers (1)
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Why is electric power is transmitted over long distances at high voltage?
(Solved)
Explain why electric power is transmitted over long distances at high voltage.
Date posted:
February 20, 2017
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Answers (1)
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State Lenz’s Law of electromagnetic induction.
(Solved)
State Lenz’s Law of electromagnetic induction.
Date posted:
February 20, 2017
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Answers (1)
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What causes electromagnetic damping in a moving coil galvanometer?
(Solved)
What causes electromagnetic damping in a moving coil galvanometer?
Date posted:
February 18, 2017
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Answers (1)
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State the laws of electromagnetic induction.
(Solved)
State the laws of electromagnetic induction.
Date posted:
February 18, 2017
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Answers (1)
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Radiant heat from the sun penetrates a glass sheet while radiant heat from burning wood is cut off by the glass sheet. Explain
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Explain the fact that radiant heat from the sun penetrates a glass sheet while radiant heat from burning wood is cut off by the glass sheet.
Date posted:
February 18, 2017
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Answers (1)
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State the difference between X-rays and gamma rays in the way in which they are produced.
(Solved)
State the difference between X-rays and gamma rays in the way in which they are produced.
Date posted:
February 18, 2017
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Answers (1)
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State the reasons why radio waves signals are easier to receive than TV (television) signals in a place surrounded by hills
(Solved)
State the reasons why radio waves signals are easier to receive than TV (television) signals in a place surrounded by hills
Date posted:
February 18, 2017
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Answers (1)
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State two uses of microwaves.
(Solved)
State two uses of microwaves.
Date posted:
February 18, 2017
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Answers (1)
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Arrange the following in order of increasing frequencies
(Solved)
Arrange the following in order of increasing frequencies - Gamma radiation, Radio waves, Infrared, and X - rays
Date posted:
February 18, 2017
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Answers (1)
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A balloon is filled with a gas which is lighter than air. It is observed to rise in air up to a certain height.
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A balloon is filled with a gas which is lighter than air. It is observed to rise in air up to a certain height. State a reason why the balloon stops rising.
Date posted:
February 18, 2017
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Answers (1)
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State the law of flotation
(Solved)
State the law of flotation
Date posted:
February 18, 2017
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Answers (1)
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When a piece of metal is placed on water, it sinks. But when the same piece of metal is placed on a block of wood, both are found to float.
(Solved)
When a piece of metal is placed on water, it sinks. But when the same piece of metal is placed on a block of wood, both are found to float. Explain this observation.
Date posted:
February 18, 2017
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Answers (1)
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A block of glass of mass 250 g floats in mercury. What volume of glass lies under the surface of the mercury? (Density of mercury is 13.6 x 103Kgm-3)
(Solved)
A block of glass of mass 250 g floats in mercury. What volume of glass lies under the surface of the mercury? (Density of mercury is 13.6 x 103Kgm-3)
Date posted:
February 18, 2017
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Answers (1)
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A block of wood weighing 2.0 N is held under water by a string attached to the bottom of a container. The tension in the string is 0.5 N
(Solved)
A block of wood weighing 2.0 N is held under water by a string attached to the bottom of a container. The tension in the string is 0.5 N. Determine the density of the wood.
Date posted:
February 18, 2017
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Answers (1)
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Ice cubes float on water and solid benzene sinks in liquid benzene, Explain
(Solved)
Explain the following observation: Ice cubes float on water and solid benzene sinks in liquid benzene
Date posted:
February 18, 2017
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Answers (1)
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A solid copper sphere will sink in water while a hollow copper sphere of the same mass may float.
(Solved)
A solid copper sphere will sink in water while a hollow copper sphere of the same mass may float. Explain this observation.
Date posted:
February 18, 2017
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Answers (1)
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When a bus goes a round bend on a flat road, it experiences a centripetal force, State what provides the centripetal force and the purpose of banking roads at bends.
(Solved)
a) When a bus goes a round bend on a flat road, it experiences a centripetal force. State what provides the centripetal force
b) State the purpose of banking roads at bends.
Date posted:
February 18, 2017
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Answers (1)