This document provides information about electricity, circuits, and circuit components. It defines key terms like closed and open circuits, conductors and insulators, electric current, voltage, resistance, and circuit symbols. It explains that a closed circuit with a power source is needed for current to flow. It also describes the differences between series and parallel circuits, noting that in series circuits the current is the same at all points, while in parallel circuits the currents can be different sizes.
the ratio of the actual electrical power dissipated by an AC circuit to the product of the r.m.s. values of current and voltage. The difference between the two is caused by reactance in the circuit and represents power that does no useful work.
This is the simple ppt explaining about the main components of the power systems. especially we are determining the insulators and its types with real time pictures which are attractive,
This PowerPoint depicts definition of Power Factor , its related factors, its necessity, its cause for low power factor, including graphics and graphs for better understanding among electrical students. It also consists of ways of improving Power Factor using capacitor and other devices. Also it has reference to the links from where it has been considered.
Tan delta is the insulation power factor & is equal to the ratio of power dissipated in the insulation in watts to the product of effective voltage & current in volt ampere when tested under sinusoidal voltage.
the ratio of the actual electrical power dissipated by an AC circuit to the product of the r.m.s. values of current and voltage. The difference between the two is caused by reactance in the circuit and represents power that does no useful work.
This is the simple ppt explaining about the main components of the power systems. especially we are determining the insulators and its types with real time pictures which are attractive,
This PowerPoint depicts definition of Power Factor , its related factors, its necessity, its cause for low power factor, including graphics and graphs for better understanding among electrical students. It also consists of ways of improving Power Factor using capacitor and other devices. Also it has reference to the links from where it has been considered.
Tan delta is the insulation power factor & is equal to the ratio of power dissipated in the insulation in watts to the product of effective voltage & current in volt ampere when tested under sinusoidal voltage.
Electronics and Communication Engineering is the Branch of Engineering. Electronics and Communication Engineering field requires an understanding of core areas including Engineering Graphics, Computer Programming,Electronics Devices and Circuits-I, Network Analysis, Signals and Systems, Communication Systems, Electromagnetics Engineering, Digital Signal Processing, Embedded Systems, Microprocessor and Computer Architecture. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus. Visit : https://ekeeda.com/streamdetails/stream/Electronics-and-Communication-Engineering
this presentation is based on magnetic effect of electric current, a which many of us have studies or will be studying in higher classes.this presentation is a better way of understanding the topic and in a visual way
The charged particles whose flow in a definite direction constitutes the electric current are called current carriers. e.g. electrons in conductors, ions in electrolyte, electrons and holes in semiconductor.
The charged particles whose flow in a definite direction constitutes the electric current are called current carriers. e.g. electrons in conductors, ions in electrolyte, electrons and holes in semiconductor.
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1. Unit8 Making Use of Electricity
Worksheet 8.1 --- Pre-Study
23.1 Making electricity flow
1. If the bulb in a closed circuit didn’t light up, which circuit component would you
check? Explain.
Check the battery. If the battery was flat, the bulb will not light up.
Check the bulb. If the bulb was broken, it will not light up.
Check the contacts. If the contact were loose, the bulb will not light up.
2. A continuous and complete circuit is called a closed circuit,
while a circuit with a gap is called an open circuit.
3. Write down the TWO conditions needed for electric current to flow.
(1) The circuit is complete
(2) There is a source of electricity
4. An electrical conductor allows an electric current to pass through.
5. An electrical insulator does not allow electric current to flow through.
6. Determine whether the following materials are conductors or insulators.
Conductor or Conductor or
Materials Materials
insulator? insulator?
Wooden
Insulator Aluminium foil conductor
chopsticks
Iron paper clip Conductor Rubber tubing insulator
Glass rod Insulator Coins conductor
Steel spoon Conductor Salt water conductor
Wet wood Conductor Oil insulator
Cola Conductor Graphite conductor
Tap water Conductor Distilled water insulator
Air Insulator Copper conductor
Paper Insulator Sellotape insulator
2. 23.2 Electric current
8. An atom consists of a positively charged nucleus surrounded by
many tiny negatively charged particles called electrons.
9. The flow of free electrons is called an electric current.
10. We can use an ammeter to measure the size of an electric current.
11. The unit of electric current is ampere (A).
Small currents are measured in milliamperes (mA).
12. 1 mA = 0.001 A
13. Electric current can be measured by an ammeter.
14. Electric current is measured in amperes.
23.3Voltage
15. Voltage is the ‘electrical push’ that makes electrons flow in a circuit.
16. We can use a voltmeter to measure voltage.
17. The unit of voltage is volt (V).
18. Voltage can be measured by a voltmeter.
19. Voltage is measured in volts.
20. Voltage can cancel each other if the cells are connected in opposite direction.
23.4Resistance
21. The particles that make up a conductor can resist the flow of free electrons.
This is called resistance.
22. The unit of resistance is ohm ().
3. 23. Resistance can be measured by multimeter.
24. Resistors are used to limit or control the size of the current in a circuit.
25. Wires made of different materials have different resistances.
26. The resistance of a wire depends on its thickness.
A thicker wire has a smaller resistance.
27. The resistance of a wire depends on its length.
A long wire has a larger resistance.
28. Unlike a resistor that has a fixed resistance, the resistance of a rheostat can be
changed.
29. List TWO examples of application of rheostats in daily lives:
(1) Volume control of a hi-fi set
(2) Control units of a joystick
24.1 Circuit symbols and circuit diagram
30. We can draw a circuit diagram to represent an actual circuit.
31. Draw the circuit symbol of the following circuit components.
Circuit component Circuit symbol Circuit component Circuit symbol
Connecting wire Battery
Swtich Light bulb
Ammeter Voltmeter
Resistor Rheostat
4. 24.2 Series circuits and Parallel Circuits
32.
Electric Circuit Features
Series circuit ** There is only one path for electric current to flow.
** Currents at different points in the circuit are the same in size.
Parallel circuit ** There is more than one path for electric current to flow.
** Currents at different points in the circuit may be different is size.
33. Series circuit:
When light bulb are connected inseries,
there is only one path for the electric current to flow.
Therefore, if one of the bulbs burns out or is removed,
the circuit will become incomplete and other bulb will go out.
34. Parallel circuit:
When light bulbs are connected inparallel,
there are several branches through which the electric current can flow.
Therefore, if one of the bulbs burns out or is removed,
the electric current can still pass through other branches.
Therefore, other bulbs can still light up.
35. In a series circuit, the current is the same (the same / different) at different points
in the circuit.
36. In a parallel circuit,
(a) the current flowing in mainloop is the sum of the currents flowing in the branches.
(b) A larger current passes through the branch with a lower resistance.