Electricity is one of the greatest discoveries made by man as it is the energy which is responsible for powering devices, transportation systems, communication networks, businesses, and houses every day. Electricity is an essential part of everyday life, from flipping a switch to powering a refrigerator, or charging a mobile phone. Although so important, many people are using electrical devices on a daily basis without grasping what is electricity. There is more to the basic principles of electrical systems than meets the eye. Through exercises involving circuits, current, voltage, resistance and power, students and beginners can develop a better understanding of the way electrical energy flows and has useful applications in the home and workplace.
One helpful way to think of electricity flowing through a circuit is to imagine that it travels in a circuit. Pipes in a plumbing system carry water while conductors in an electrical system carry electricity. Electricity can only flow when there is a complete circuit around which it can move from point to point and back. This simple law is the reason electrical appliances and devices need batteries, power outlets, switches and wires. When learners have a conceptual understanding of how electricity flows in a circuit, it becomes easier to comprehend concepts like current, voltage, and resistance.
What Is Electricity?
Electricity is the flow of charged particles, called electrons, that have an electric charge. These electrons are part of atoms that are the components of matter. Electrons are free to move relatively in many materials, particularly in metals like copper and aluminium. If these electrons are able to move in an orderly way, an electric current is formed. This current can flow through wires and be used to operate and light up appliances, like a TV, a computer, and lights.
A helpful comparison is to a hectic street. When electrons move along the road, they correspond to a car driving along the road. Whereas to move through the traffic, there must be the road, for the electrons to move from place to place, there must be conducting materials. These electrons transfer energy which can be converted into light, heat, sound or mechanical energy. Light energy is produced from electrical energy when it is used in a lamp. When a fan is turned by electricity, it is transformed into the movement of the blades.
Electricity naturally occurs in the environment as well. One of the most spectacular examples of electrical activity is lightning. But the electricity supplied to the houses and industries is generated and controlled carefully at the power plants, the transmission system and the electrical circuit area. The concept of electron flow is essential for comprehending the working of electrical systems.
Understanding Electrical Circuits
An electrical circuit is a closed loop in which electricity flows. In the absence of a complete circuit, electricity cannot flow from its source to the device to which it is supplied. Closed circuits are the basic components of all working electrical circuits, in which electrons circulate continuously. Circuits can be used in flashlights, toys, large electrical industrial equipment and power distribution systems.
Typically, a simple circuit consists of four components, a power source, conducting wires, a load, and (optionally) a switch. This can be with battery or power outlet. The wires are used to allow the current to flow. Any device that consumes electrical energy, such as a bulb or motor, is called the load. A switch (S) is used to open or close the circuit. Once the switch is closed, the path is closed and current flows. When the switch is opened the circuit is broken and the current ceases to flow.
Knowing about circuits can enable explanations of why devices don’t work when they are broken or the battery is exhausted. In either case, the entire circuit for the current flow is broken. This is true of nearly all electrical appliances with which people use daily, and one of the most essential parts of electrical education is knowledge of circuits.
This is a closed circuit diagram
Battery
+ –
| |
| |
[ Light Bulb ]
| |
|_____|
The electricity flows as the circuit is completed.
What is the current of electricity?
Electrical current is the movement of an electric charge down a conductor. It is a measure of the number of electrons passing through a point in a circuit in a specific amount of time. The unit of current is the ampere or amps. The greater the number of electrons flowing through a conductor, the higher the current.
Current can be likened to water running through a pipe. The faster the water flows through the pipe the greater the flow rate. In the same way, the more electrons that flow through a wire, the more electrical current there is. The transfer of charge from the power source to electrical devices. If there is no current, then the appliances and electronic systems would not work.
There are different currents required for energy needs of different devices. A small LED light may draw very small current while an electric oven may draw a very large current. Electrical engineers design systems carefully to ensure that just the right amount of current gets to each device safely. Current will help learners develop an appreciation of the effective distribution of energy throughout the house and the workplace.
Understanding Voltage: The Driving Force
The voltage is sometimes referred to as the “pressure” that causes electrons to flow through a circuit. It is the voltage difference between two points and is measured in voltage. Electrons are said to be moving around when there is a current; there is pressure that makes the electrons move around when there is a voltage. If there is no voltage, then the electrons would not need to flow in the circuit.
It’s easy to compare water through pipes. Suppose there is a water tank high above the ground. The pressure of water pushing through connected pipes is the result of the water’s height. The effect of voltage is similar, but is applied as an electrical pressure that pushes electrons in conductors. The higher the voltage, the more current will flow, if the rest of the circuit is the same.
A common example of voltage is batteries. A regular battery establishes a voltage difference between its positive and negative terminals. The difference promotes electrons to flow through an interconnected circuit. Household electrical outlets also supply voltage power to run appliances. By learning about voltage, learners will be able to appreciate the need for an energy source in electrical systems and how electrical pressure affects the functioning of a circuit.
Simple Diagram: Voltage Analogy,
Water Tank
|
|
Pressure
↓
Pipe → Water Flow
Voltage → Electron Flow
The higher the voltage the more electrical pressure it has a force that makes it more difficult to move a current through a circuit. A force that opposes the flow of a current.
The opposition which is offered by a material to the flow of the electric current is called resistance. All conductors provide a certain amount of resistance, but some materials have more resistance than others. The unit of resistance is the ohm. The more resistance a circuit has, the harder it will be for current to flow.
It’s helpful to think about how traffic flows on a road. Wide road is easier for vehicles to go on, narrow congested road makes it difficult. Resistance works in the same way in an electrical circuit. Some materials like copper have low resistance and are good conductors. Other materials such as rubber and plastics are also highly resistant and are often used to stop unwanted electrical flow.
Resistance is significant in electrical safety and functioning of devices. Controlled resistance is used in many useful devices, including light bulbs, heaters, and others. Resistance is what transforms electricity to light and heat in a light bulb. The ability of a material to conduct electricity or not can be understood based on the concept of resistance.
Current Electrical Power and Energy Use
Electrical power is the amount or rate of electrical energy used or transferred. It’s usually expressed in watts and indicates how fast a device consumes energy. Voltage and current are both factors in power. More energy required = higher power level.
Examples of electrical power are household appliances. The power usage of a small clock might be a few watts, but an air conditioner can use thousands of watts. The difference is because of the energy required to carry out a function by one device compared to the other. The amount of work a device can do in a certain amount of time depends on electrical power.
Learning about power can assist consumers in making informed decisions about energy consumption. Power ratings are shown on many appliances, revealing their electrical needs. These ratings help homeowners calculate energy use and cost of operation. Power calculations are also performed by electrical engineers when creating a system that supplies power into the house, business, or industrial facility in a safe manner.
How Everyday Electrical Devices Work
Each of the electrical devices that we use follows the same basic principles as covered in this article. The concepts are the same whether you are looking at a flashlight, a computer, refrigerator, or a television. Power source: Source is needed to provide voltage, current circulates through the complete circuit, resistance affects the movement of electrons in the circuit, power determines how quickly energy is used.
Think about a flashlight. The battery supplies a potential difference which causes electrons to flow through the circuit. The switch is closed and current passes through the bulb when the switch is turned on. The electrical energy in the bulb is transformed into light and heat, which lights up the flashlight. Switch closed – current flows through the circuit.Switch open – current does not flow through the circuit. This is a simple example to illustrate how several electrical ideas combine to make a working device.
More sophisticated devices work on the same principles, but have more complicated components and more complexity. The electronic elements are extremely small and are arranged in circuits in a computer. Household appliances have motors, heaters, sensors and control systems. Although they differ in many respects, circuits operate on the basis of the flow of electricity.
Simple Diagram: Household Circuit
Power Source
|
|
Switch
|
|
Appliance
|
|
Back to Source
Complete path = Working circuit
Why Learning Basic Electricity Matters
The knowledge of simple electric principles can be useful in real life other than in studying it. Understanding of electrical circuits, voltage, current, resistance and power enables people to operate electrical products in a safer and more effective manner. It also provides a basis for the study of electronics, engineering, computer technology and renewable energy systems. Students in technical fields will find these concepts useful for many modern careers, as they require some understanding of electricity.
Energy literacy also equips people with the knowledge to make energy decisions related to using appliances. As technology advances, society is becoming more and more reliant on electrical systems. The knowledge of the operation of these systems fosters curiosity, enhances problem-solving abilities, and promotes electrical equipment interaction in a safe manner. Simple knowledge can transform complex technologies into something easier to understand and approach.
Conclusion
Electricity is used in almost every facet of modern life, and the principles behind it are surprisingly simple. Energy from electricity is the movement of electrons through full circuits. Current is a measure of the flow of electric charge, voltage is the force that pushes electrons, resistance is the opposition to electron flow and power is how fast energy is used. These ideas can be combined to understand how electrical systems work and how devices transform electrical energy into other forms of energy like light, heat and motion.
Learners learn about how electricity moves through a circuit, which helps them to understand how common technology works. All electrical devices are based on the same principles, from flashlights to complex electronic systems. These concepts are the basis for further study and will help people to understand and appreciate the science that is used in the world today. With the ever-evolving technology, knowledge of electricity will continue to be part and parcel of science.
