I = V/R
= 240/500
= 0.48A.
Wilfykil answered the question on March 23, 2019 at 10:45
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A student learnt that a battery of eight dry cells each 1.5V has a total e.m.f of 12V the same as a car battery. He...
(Solved)
A student learnt that a battery of eight dry cells each 1.5V has a total e.m.f of 12V the same as a car battery. He connected in series eight new dry batteries to his car but found that they could not start the engine. Give a reason for this observation
Date posted:
March 23, 2019
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Answers (1)
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The figure below shows an arrangement of capacitors connected to a 10V d.c supply. Determine:(i) The charge stored in the 2µ F capacitor.(ii) The total capacitance...
(Solved)
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Date posted:
March 23, 2019
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Answers (1)
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Date posted:
March 23, 2019
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State the precaution that is taken when charging a metal object
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State the precaution that is taken when charging a metal object
Date posted:
March 23, 2019
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Answers (1)
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In the clothing and textile industries the machines experiences electrostatics forces at certain points
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Date posted:
March 23, 2019
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Two isolated and insulated spheres A and B carry the same positive charge. Sketch the electric lines of force of their field when placed close...
(Solved)
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Date posted:
March 23, 2019
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Answers (1)
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(Solved)
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Date posted:
March 22, 2019
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Answers (1)
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State with reason the purpose of the oil that circulates in a motorcar engine.
(Solved)
State with reason the purpose of the oil that circulates in a motorcar engine.
Date posted:
March 22, 2019
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Answers (1)
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In the study of a free fall, it is assumed that the force f acting on a given body of mass m is gravitational, given...
(Solved)
In the study of a free fall, it is assumed that the force f acting on a given body of mass m is gravitational, given by F= mg. State two other forces that act on the same body.
Date posted:
March 22, 2019
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Answers (1)
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A student was heard saying “the mass of a ball on the moon is one sixth its mass on earth”. Give a reason why this...
(Solved)
A student was heard saying “the mass of a ball on the moon is one sixth its mass on earth”. Give a reason why this statement is wrong.
Date posted:
March 22, 2019
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Answers (1)
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Explain how to calculate the efficiency of the pulley system when the weight of load and effort is given
(Solved)
Explain how to calculate the efficiency of the pulley system when the weight of load and effort is given.
Date posted:
March 19, 2019
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A vacuum pump was used to pump out air from the glass tube immersed in liquids as shown in the figure below . After sometimes...
(Solved)
A vacuum pump was used to pump out air from the glass tube immersed in liquids as shown in figure below.
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Date posted:
March 18, 2019
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Answers (1)
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A metre rule is pivoted at the 20cm mark and it hangs at the 90cm mark from a spring balance 75g wt. Where is the...
(Solved)
A metre rule is pivoted at the 20cm mark and it hangs at the 90cm mark from a spring balance 75g wt. Where is the centre of gravity of the metre rule if it weighs 125g?
Date posted:
March 2, 2019
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Answers (1)
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Suggest why the rate of heat flow through a pane of glass is greater on a windy day
(Solved)
Suggest why the rate of heat flow through a pane of glass is greater on a windy day.
Date posted:
February 26, 2019
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Answers (1)
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An electric kettle with a shiny outer surface would be more efficient than one with a dull outer surface. Explain
(Solved)
An electric kettle with a shiny outer surface would be more efficient than one with a dull outer surface. Explain
Date posted:
February 23, 2019
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Answers (1)
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How many images would be seen from two mirrors when reflecting surfaces make an angle of 60 degree with each other?
(Solved)
How many images would be seen from two mirrors when reflecting surfaces make an angle of 60 degree with each other?
Date posted:
February 23, 2019
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Answers (1)
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A body weighs 32N in kerosene and 30N in water. If the body weighs 40N in air, find the relative density of kerosene.
(Solved)
A body weighs 32N in kerosene and 30N in water. If the body weighs 40N in air, find the relative density of kerosene.
Date posted:
February 11, 2019
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Answers (1)
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A metal block of density 7.8g/cm3 weighs 117N in air. Find the weight of the block when fully immersed in water of density 1.0g/cm3.
(Solved)
A metal block of density 7.8g/cm3 weighs 117N in air. Find the weight of the block when fully immersed in water of density 1.0g/cm3.
Date posted:
February 2, 2019
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Answers (1)
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A particle revolves at 2Hz in a circle of radius 2m. Calculate its linear speed and angular velocity.
(Solved)
A particle revolves at 2Hz in a circle of radius 2m. Calculate its:
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b) Angular velocity
Date posted:
January 29, 2019
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Answers (1)
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A screen is placed 80cm from an object. A lens is used to produce on the screen an image with a magnification of 3. What...
(Solved)
A screen is placed 80cm from an object. A lens is used to produce on the screen an image with a magnification of 3. What is the distance between the object and the lens? Calculate the focal length of that lens.
Date posted:
January 21, 2019
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Answers (1)