Get premium membership and access questions with answers, video lessons as well as revision papers.
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
- Give the applications of reflection of sound (Solved)
Give the applications of reflection of sound.
Date posted: December 9, 2017. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- The electrons are accelerated by a p.d. of 24000v in a given X-rays tube. Assuming all the energy goes to produce X-rays, determine the frequency...(Solved)
The electrons are accelerated by a p.d. of 24000v in a given X-rays tube. Assuming all the energy goes to produce X-rays, determine the frequency of the X-rays produced. {Plank’s constant h= 6.62 x 10^-(34) Js and the charge on an electron e = 1.6 X10^(-19)C}
Date posted: December 7, 2017. Answers (1)
- 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. Answers (1)
- Define soil water potential(Solved)
Define soil water potential.
Date posted: December 7, 2017. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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)
- 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. Answers (1)
- How do you convert binary number to BCD.(Solved)
How do you convert binary number to BCD.
Date posted: December 5, 2017. Answers (1)
- 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. Answers (1)
- Briefly explain why rooms are at a lower level and ventilators at a higher level
(Solved)
Briefly explain why rooms are at a lower level and ventilators at a higher level
Date posted: December 5, 2017. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- Alternating current (a.c.) is used for transmitting electricity over long distance, state the reason. (Solved)
Alternating current (a.c.) is used for transmitting electricity over long distance, state the reason.
Date posted: December 4, 2017. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)