Lead acid accumulator has the following advantages over primary cells;
-it is rechargeable.
-it is reusable.
-contains less toxic elements compared to primary cell.
-has longer lifetime than primary cell.
-mostly preferred for supplying higher voltages.
-can be recycled.
-saves on cost of using electronic devices as they rarely require replacement.
-large currents can be drawn from it for a long time.
Andreaz answered the question on December 11, 2017 at 08:06
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Give the applications of reflection of sound
(Solved)
Give the applications of reflection of sound.
Date posted:
December 9, 2017
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Answers (1)
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The surface of a metal was struck by a light of certain wavelength. State what determine the maximum kinetic energy of the electron emitted.
(Solved)
The surface of a metal was struck by a light of certain wavelength. State what determine the maximum kinetic energy of the electron emitted.
Date posted:
December 7, 2017
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Answers (1)
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Calculate the photon energy in ultra violet radiation whose frequency is 8.70 x 10^14 Hz. (Plank’s constant, h = 6.63 x 10^-34Js)
(Solved)
Calculate the photon energy in ultra violet radiation whose frequency is 8.70 x 10^14 Hz. (Plank’s constant, h = 6.63 x 10^-34Js)
Date posted:
December 7, 2017
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Answers (1)
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State common systems of unit as used in environmental soil physics
(Solved)
State common systems of unit as used in environmental soil physics.
Date posted:
December 7, 2017
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Answers (1)
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Define soil water potential
(Solved)
Define soil water potential.
Date posted:
December 7, 2017
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Answers (1)
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A stone is thrown in water at a distance of 6 m from a bank and produces 12 crests of waves which took 10 minutes...
(Solved)
A stone is thrown in water at a distance of 6 m from a bank and produces 12 crests of waves which took 10 minutes to reach the bank.
Find the frequency of the wave.
Date posted:
December 6, 2017
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Answers (1)
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Define the term soil water potential as used in physics
(Solved)
Define the term soil water potential as used in physics.
Date posted:
December 6, 2017
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Answers (1)
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The X-rays are used for detecting cracks inside metal beams (i) State the type of the x-rays used (ii) Give a reason for the above answer.
(Solved)
The X-rays are used for detecting cracks inside metal beams.
i. State the type of the x-rays used.
ii. Give a reason for the above answer.
Date posted:
December 5, 2017
.
Answers (1)
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If one increases the E.H.T. in the X-ray tube, state and explain what will happen to the X-rays produced.
(Solved)
If one increases the E.H.T. in the X-ray tube, state and explain what will happen to the X-rays produced.
Date posted:
December 5, 2017
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Answers (1)
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How do you convert binary number to BCD.
(Solved)
How do you convert binary number to BCD.
Date posted:
December 5, 2017
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Answers (1)
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How do you convert Binary Coded Decimal(BCD) to binary
(Solved)
How do you convert Binary Coded Decimal(BCD) to binary.
Date posted:
December 5, 2017
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Answers (1)
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Give the two differences between the cathode ray tube (CRT) of a T.V. and the cathode ray oscilloscope (CRO).
(Solved)
Alternating current (a.c.) is used for transmitting electricity over long distance, state the reason.
Date posted:
December 4, 2017
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Answers (1)
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The follow table shows electric appliances to be used in a home. The electrical rating for each appliance is shown. The fuses available are 5A,...
(Solved)
9. The follow table shows electric appliances to be used in a home. The electrical rating for each appliance is shown. The fuses available are 5A, 15A, 30A and 45 A
Appliance-----voltage(V)-----Power(w)
T.V.----------240----------300
Iron box------240----------720
Electrical kettle--240----2400
Determine which one of the fuses is suitable for the house.
Date posted:
December 4, 2017
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Answers (1)
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Heating in the coils when current flows is one of the causes of energy loss in a transformer. State : (i) The reason why the current causes...
(Solved)
Heating in the coils when current flows is one of the causes of energy loss in a transformer. State :
(i) The reason why the current causes heating.
(ii)How the heating can be minimized.
Date posted:
December 4, 2017
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Answers (1)
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The primary coil of a transformer has 2000 turns and secondary coil is connect to a 240V a.c. mains supply (a) Explain how an e.m.f. is...
(Solved)
The primary coil of a transformer has 2000 turns and secondary coil is connect to a 240V a.c. mains supply.
(a)Explain how an e.m.f. is induced in the secondary voltage.
(b)Determine the secondary voltage
Date posted:
December 4, 2017
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Answers (1)
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In a transformer the ratio of primary to secondary is 1:10. A current of 200mA flow through a 200 ohm resistor in the secondary circuit....
(Solved)
In a transformer the ratio of primary to secondary is 1:10. A current of 200mA flow through a 200 ohm resistor in the secondary circuit. Assuming that the transformer is 100% efficient, determine:
a. The secondary voltage.
b. The primary voltage.
c. The primary current.
Date posted:
December 4, 2017
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Answers (1)
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Electric power is transmitted over long distance at high voltage. Explain.
(Solved)
Electric power is transmitted over long distance at high voltage. Explain.
Date posted:
December 4, 2017
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Answers (1)
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Explain how the energy losses are reduced in a transform by having : (a) A soft iron core (b) A laminated core
(Solved)
Explain how the energy losses are reduced in a transform by having :
a. A soft iron core
b. A laminated core
Date posted:
December 4, 2017
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Answers (1)
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State the five terms of the semi empirical mass formula.
(Solved)
State the five terms of the semi empirical mass formula.
Date posted:
November 30, 2017
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Answers (1)
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What is a transistor?
(Solved)
What is a transistor?
Date posted:
November 30, 2017
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Answers (1)