a) Rectification (smoothing circuits)
In the conversion of alternating current to direct current using diodes, a capacitor is used to maintain a high d.c. voltage. This is called smoothing or rectification.
b) Reduction of sparking in the induction coil
A capacitor is included in the primary circuit of the induction coil to reduce sparking.
c) In tuning circuits
A variable capacitor is connected in parallel to an inductor in the tuning circuit of a radio receiver. When the capacitance of the variable capacitor is varied , the electrical oscillations between the capacitor and the inductor changes. If the frequency of oscillations is equal to the frequency of the radio signal at the aerial of the radio, that signal is received.
d) In delay circuits
Capacitors are used in delay circuits designed to give intermittent flow of current in car indicators.
e) In camera flash
A capacitor in the flash circuit of a camera is charged by the cell in the circuit. When in use, the capacitor discharges instantly to flash.
chrispohmomanyi answered the question on February 9, 2018 at 06:29
- When Moses rubbed a glass rod on a duster and then held it near a few pieces of paper, it did not move them or...(Solved)
When Moses rubbed a glass rod on a duster and then held it near a few pieces of paper, it did not move them or pick them up. He concluded that there was no transfer of electric charge between the duster and the brass rod. He was wrong. Give a reason why he was wrong
Date posted: February 9, 2018. Answers (1)
- State the applications of total internal reflection(Solved)
State the applications of total internal reflection.
Date posted: February 9, 2018. Answers (1)
- State three properties of cathode rays(Solved)
State three properties of cathode rays
Date posted: February 9, 2018. Answers (1)
- State why mains electricity for long distances is transmitted at high voltages. (Solved)
State why mains electricity for long distances is transmitted at high voltages.
Date posted: February 9, 2018. Answers (1)
- Light passes through an opening of width 2 cm. Explain why light is not diffracted in the same way as sound at a similar size...(Solved)
Light passes through an opening of width 2 cm. Explain why light is not diffracted in the same way as sound at a similar size opening.
Date posted: February 9, 2018. Answers (1)
- Why is a burn from steam of boiling water more severe than that of boiling water itself?(Solved)
Why is a burn from steam of boiling water more severe than that of boiling water itself?
Date posted: February 9, 2018. Answers (1)
- A bullet is fired horizontally at a target. Neglecting air resistance, give a reason why the horizontal acceleration of the bullet is zero.(Solved)
A bullet is fired horizontally at a target. Neglecting air resistance, give a reason why the horizontal acceleration of the bullet is zero.
Date posted: February 9, 2018. Answers (1)
- If the mirror is rotated through an angle of 10 degrees, by how many degrees will the reflected ray be rotated?(Solved)
If the mirror is rotated through an angle of 10 degrees, by how many degrees will the reflected ray be rotated?
Date posted: February 9, 2018. Answers (1)
- A search boat uses a signal of frequency 6.0 x 104 Hz to detect a sunken
ship directly below. Two reflected signals are received; one...(Solved)
A search boat uses a signal of frequency 6.0 x 104 Hz to detect a sunken
ship directly below. Two reflected signals are received; one after 0.1
seconds from sunken boat and the other after 0.14 seconds from the sea
bed. If the sea bed is 98 m below the boat, determine:-
(i)The speed of the signal in water.
(ii)The depth of the sunken ship below the boat
Date posted: February 7, 2018. Answers (1)
- The half-life of an element X is 3.83 days. A sample of this element is
found to have an activity rate of 1.6 x 103...(Solved)
The half-life of an element X is 3.83 days. A sample of this element is
found to have an activity rate of 1.6 x 103 disintegrations per second at a
particular time. Determine its activity rate after 19.15 days
Date posted: February 7, 2018. Answers (1)
- A gas occupies a volume of 4000 litres at a temperature of 37 degrees celcius and normal atmospheric pressure. Determine the new volume of the gas...(Solved)
A gas occupies a volume of 4000 litres at a temperature of 37 degrees celcius and
normal atmospheric pressure. Determine the new volume of the gas if it is
heated at constant pressure to a temperature of 670C (normal atmospheric
pressure P= 1.01 x 105 pa)
Date posted: February 7, 2018. Answers (1)
- How is the image on a pin hole camera increased?(Solved)
How is the image on a pin hole camera increased?
Date posted: February 7, 2018. Answers (2)
- Distinguish between solid,liquid and gas with reference to intermolecular forces?(Solved)
Distinguish between solid,liquid and gas with reference to intermolecular forces?
Date posted: February 5, 2018. Answers (1)
- Give two mechanical properties of composite materials used in fixing teeth(Solved)
Give two mechanical properties of composite materials used in fixing teeth.
Date posted: February 5, 2018. Answers (1)
- State factors that affect the rate of evaporation(Solved)
State factors that affect rate of evaporation
Date posted: January 30, 2018. Answers (1)
- State the three Newton's laws(Solved)
State the three Newton's laws
Date posted: January 30, 2018. Answers (1)
- Explain the benefits of thermal imaging cameras.(Solved)
Explain the benefits of thermal imaging cameras.
Date posted: January 29, 2018. Answers (1)
- State the advantages of using temperature data loggers.(Solved)
State the advantages of using temperature data loggers.
Date posted: January 29, 2018. Answers (1)
- State the advantages of using K-type thermometers.(Solved)
State the advantages of using K-type thermometers.
Date posted: January 29, 2018. Answers (1)
- State the advantages of using probe thermometers.(Solved)
State the advantages of using probe thermometers.
Date posted: January 29, 2018. Answers (1)