Power=VI
50,000W= 240VxI
I=50,000/240 =208.8A
Hence, power loss= 208.37x0.4
=17,360.556W
%power loss= (17360.556/50000)x100 =9.72%
Moraa orina answered the question on April 11, 2018 at 17:46
- Some length of a power line has a resistance of 10? and is transmitting 11kV and a current of 1A. If the
voltage is stepped...(Solved)
Some length of a power line has a resistance of 10Ω and is transmitting 11kV and a current of 1A. If the
voltage is stepped up to 160kV by a transformer, calculate:
a) The initial power loss
b) The power loss after step up
Date posted: April 11, 2018. Answers (1)
- State the main causes of energy losses in transformers:(Solved)
State the main causes of energy losses in transformers:
Date posted: April 11, 2018. Answers (1)
- A student designed a transformer to supply a current of 10A at a potential difference of 60V to an electric motor from an ac supply...(Solved)
A student designed a transformer to supply a current of 10A at a potential difference of 60V to an electric motor from an ac supply of 240V. if the efficiency of the transformer is 80%, calculate:
a) The power supplied to the transformer.
b) The current in the primary coil
Date posted: April 11, 2018. Answers (1)
- Calculate the number of turns of the secondary coil of a step down transformer which would enable a 12V bulb
to be used with a...(Solved)
Calculate the number of turns of the secondary coil of a step down transformer which would enable a 12V bulb
to be used with a 240V ac supply if there are 480 turns in the primary coil.
Date posted: April 11, 2018. Answers (1)
- State the applications of electromagnetic induction(Solved)
State the applications of electromagnetic induction
Date posted: April 11, 2018. Answers (1)
- Arrange the following radiations in order of increasing wavelength: infra red, blue light, UV light, radio
waves and X-rays.(Solved)
Arrange the following radiations in order of increasing wavelength: infra red, blue light, UV light, radio
waves and X-rays.
Date posted: April 11, 2018. Answers (1)
- An X-ray machine produces a radiation of wavelength 1.0x10-11m. calculate:
a) The frequency of the radiation.
b) The energy content of the radiation. (Solved)
An X-ray machine produces a radiation of wavelength 1.0x10-11m. calculate:
a) The frequency of the radiation.
b) The energy content of the radiation.
Date posted: April 11, 2018. Answers (1)
- A radio transmitter produces waves of frequency 1.0x108Hz. Calculate the wavelength of the signal.(Solved)
A radio transmitter produces waves of frequency 1.0x108Hz. Calculate the wavelength of the signal.
Date posted: April 11, 2018. Answers (1)
- A cyclist who is travelling at 20m/s negotiates a bend of radius 45m. he inclines at an angle O to the
vertical. Calculate:
a) The centripetal...(Solved)
A cyclist who is travelling at 20m/s negotiates a bend of radius 45m. he inclines at an angle Ɵ to the
vertical. Calculate:
a) The centripetal acceleration
b) The angle of inclination Ɵ
Date posted: April 11, 2018. Answers (1)
- A vehicle moves round a banked balanced road at a speed of 20m/s. if the radius of the road is 50m,
calculate the angle of...(Solved)
A vehicle moves round a banked balanced road at a speed of 20m/s. if the radius of the road is 50m,
calculate the angle of banking.
Date posted: April 11, 2018. Answers (1)
- The maximum speed at which a motorist can negotiate a corner on a level ground is 20m/s. if the radius
of the curve is 100m,...(Solved)
The maximum speed at which a motorist can negotiate a corner on a level ground is 20m/s. if the radius
of the curve is 100m, calculate:
a) The coefficient of friction, μ
b) The angle at which the road should be banked to enable the motorist negotiate the corner at a critical
speed of 20m/s.
Date posted: April 11, 2018. Answers (1)
- A bob of mass 1kg is moving in a uniform circular path in a vertical plane of radius 1m. If it is whirled at...(Solved)
A bob of mass 1kg is moving in a uniform circular path in a vertical plane of radius 1m. If it is whirled at a
frequency of 2 cycles per second, calculate:
a) The tension in the string when the bob is at the top part of the circle
b) Tension when it is at the bottom
c) At what position is the string likely to break? Why?
d) What is the minimum speed required to maintain the string under tension.
Date posted: April 11, 2018. Answers (1)
- An object of mass 0.4kg is rotated by a string at a constant speed, v in a vertical circle of radius 1m. If the
minimum...(Solved)
An object of mass 0.4kg is rotated by a string at a constant speed, v in a vertical circle of radius 1m. If the
minimum tension in the string is 3N, calculate :
a) The speed, v
b) Maximum tension in the string
c) The tension when the string is just horizontal
Date posted: April 11, 2018. Answers (1)
- An object of mass 8kg is whirled round rapidly in a vertical circle of radius 2m with a constant speed of
6m/s. Calculate the maximum...(Solved)
An object of mass 8kg is whirled round rapidly in a vertical circle of radius 2m with a constant speed of
6m/s. Calculate the maximum and minimum tension in the string. Take g=10N/kg
Date posted: April 11, 2018. Answers (1)
- A stone of mass 0.6kg attached to a string of length 0.5m is whirled in a horizontal circle at a constant speed. If the maximum...(Solved)
A stone of mass 0.6kg attached to a string of length 0.5m is whirled in a horizontal circle at a constant
speed. If the maximum tension in the string is 5N before it breaks, calculate:
a) The maximum speed of the stone
b) The maximum number of revolutions per second it can make
Date posted: April 11, 2018. Answers (1)
- A stone of mass 2kg is whirled in a horizontal circle of radius 0.5m. The tension in the string was found to
be 64N. Determine...(Solved)
A stone of mass 2kg is whirled in a horizontal circle of radius 0.5m. The tension in the string was found to
be 64N. Determine the velocity of the stone in the circle.
Date posted: April 11, 2018. Answers (1)
- Calculate the period and frequency of a particle in a circular path moving at an angular velocity of 4p
rads-1.(Solved)
Calculate the period and frequency of a particle in a circular path moving at an angular velocity of 4π
rads-1.
Date posted: April 11, 2018. Answers (1)
- A car of mass 100kg moves round a circular track of radius 100m with a linear speed of 20m/s. calculate:a) The angular velocityb) The centripetal...(Solved)
A car of mass 100kg moves round a circular track of radius 100m with a linear speed of 20m/s. calculate:
a) The angular velocity
b) The centripetal force
c) The centripetal acceleration
Date posted: April 11, 2018. Answers (1)
- A particle moves at an angular velocity of 10p rads-1 along a circular path of radius 20cm. calculate its linear speed.(Solved)
A particle moves at an angular velocity of 10p rads-1 along a circular path of radius 20cm. calculate its linear speed.
Date posted: April 11, 2018. Answers (1)
- State the differences between eye and lenses camera(Solved)
State the differences between eye and lenses camera
Date posted: April 11, 2018. Answers (1)