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To reduce the power loss; high voltage implies low current hence power loss is reduced P = I²R
Kavungya answered the question on May 31, 2019 at 15:09
- The diagram below shows part of a waveform. The numbers on the diagram show scales in metres; if the speed of the wave is 20ms¯¹,...(Solved)
The diagram below shows part of a waveform. The numbers on the diagram show scales in metres; if the speed of the wave is 20msˉ¹, determine the frequency and wavelength of the wave.
Date posted: May 31, 2019. Answers (1)
- A student designed an a.c. generator which produces a current of 10A at a p.d. of 340V. State two ways in which he can improve...(Solved)
A student designed an a.c. generator which produces a current of 10A at a p.d. of 340V. State two ways in which he can improve his generator to increase the p.d. output.
Date posted: May 31, 2019. Answers (1)
- A Bunsen burner flame brought near to the cap of a charged electroscope causes the divergence of the leaf to decrease. Explain these observations.(Solved)
A Bunsen burner flame brought near to the cap of a charged electroscope causes the divergence of the leaf to decrease. Explain these observations.
Date posted: May 31, 2019. Answers (1)
- Explain why sound cannot be heard from far when one shouts in a forest.(Solved)
Explain why sound cannot be heard from far when one shouts in a forest.
Date posted: May 31, 2019. Answers (1)
- The figure below shows the trace of a signal on CRO.
Given that the time base is set at 100ms/div., determine the frequency of the signal.(Solved)
The figure below shows the trace of a signal on CRO.
Given that the time base is set at 100ms/div., determine the frequency of the signal.
Date posted: May 31, 2019. Answers (1)
- The diagram below shows the image formed by a convex mirror. Complete the diagram to show the position of the object.(Solved)
The diagram below shows the image formed by a convex mirror. Complete the diagram to show the position of the object.
Date posted: May 31, 2019. Answers (1)
- A body of mass 5kg is attached to the end of a string of length 50cm and whirled continuously in a horizontal circle. If the...(Solved)
A body of mass 5kg is attached to the end of a string of length 50cm and whirled continuously in a horizontal circle. If the tension in the string is 81N determine the angular velocity of the body
Date posted: May 31, 2019. Answers (1)
- A pulley system having a velocity ratio of 4 is used to raise a load of 80N through a height of 0.6m at a constant...(Solved)
A pulley system having a velocity ratio of 4 is used to raise a load of 80N through a height of 0.6m at a constant speed using an effort of 20N in a time of 15 seconds. Calculate the power developed by the effort
Date posted: May 31, 2019. Answers (1)
- A spring with a spring constant of 68N/M stretches by 0.22m when a force is applied on it. Determine the energy stored in the stretched...(Solved)
A spring with a spring constant of 68N/M stretches by 0.22m when a force is applied on it. Determine the energy stored in the stretched spring.
Date posted: May 31, 2019. Answers (1)
- A bullet of mass 20g travelling at 400m/s is strapped by a concrete wall. calculate the amount of energy transferred to the wall(Solved)
A bullet of mass 20g travelling at 400m/s is strapped by a concrete wall. calculate the amount of energy transferred to the wall
Date posted: May 31, 2019. Answers (1)
- Name a device that is used to convert sound energy to electrical energy(Solved)
Name a device that is used to convert sound energy to electrical energy
Date posted: May 31, 2019. Answers (1)
- Distinguish between velocity ratio and mechanical advantage(Solved)
Distinguish between velocity ratio and mechanical advantage
Date posted: May 31, 2019. Answers (1)
- A body weighs 40N in air, 30N in water and 35N when in liquid X. Find the relative density of liquid X(Solved)
A body weighs 40N in air, 30N in water and 35N when in liquid X. Find the relative density of liquid X
Date posted: May 31, 2019. Answers (1)
- A constant mass of hydrogen gas occupies a volume of 4.0cm3 at a pressure of 2.4x105 Pa and temperature of 288k. Find its volume at...(Solved)
A constant mass of hydrogen gas occupies a volume of 4.0cm3 at a pressure of 2.4x105 Pa and temperature of 288k. Find its volume at a pressure of 1.6x105Pa when the temperature is 293K
Date posted: May 31, 2019. Answers (1)
- Two liquids of density 1100kg/m3 and 850kg/m3 are mixed in equal volumes. The mixture fills a tank of 300cmx 40cm x 50cm to the bring...(Solved)
Two liquids of density 1100kg/m3 and 850kg/m3 are mixed in equal volumes. The mixture fills a tank of 300cmx 40cm x 50cm to the bring calculate the mass of each liquid
Date posted: May 31, 2019. Answers (1)
- A vessel weighs 90g and has a specific heat capacity of 420J/Kg/K. Calculate its heat capacity(Solved)
A vessel weighs 90g and has a specific heat capacity of 420J/Kg/K. Calculate its heat capacity
Date posted: May 31, 2019. Answers (1)
- A crane just lifts 9940N when an effort of 116N is applied. Find its velocity ratio if the crane has an efficiency of 72%(Solved)
A crane just lifts 9940N when an effort of 116N is applied. Find its velocity ratio if the crane has an efficiency of 72%
Date posted: May 31, 2019. Answers (1)
- An oil drop forms a circular patch of area 5x10-3m2. If the oil drop has a volume of 9x10-12M2, calculate the thickness of the oil...(Solved)
An oil drop forms a circular patch of area 5x10-3m2. If the oil drop has a volume of 9x10-12M2, calculate the thickness of the oil molecule.
Date posted: May 31, 2019. Answers (1)
- State the reading on the micrometer gauge shown below
(Solved)
State the reading on the micrometer gauge shown below
Date posted: May 31, 2019. Answers (1)
- A concave mirror of focal length 20 cm forms a real image three times the size of the object. If the object height is 4cm;determine,...(Solved)
A concave mirror of focal length 20 cm forms a real image three times the size of the object. If the object height is 4cm;
determine, using graphical method, the:
i) object distance
ii) The image distance
Date posted: May 31, 2019. Answers (1)