Wiktor Wise
Understanding how electricity flows through a circuit board involves comprehending the basics of electrical circuits and the role of electrons. Electric current refers to the flow of electric charge, typically carried by free-moving electrons. In conductive materials like metals, electrons can move freely between atoms. By applying a voltage or potential difference across a conductor, an electric field is created, propelling electrons through the circuit. This circuit must lead from the negative charge source to the positive charge source, with electrons moving between them and creating an electric current. There are two main types of circuits: series circuits, where components are arranged end-to-end, and parallel circuits, where components are arranged side by side. In a circuit, electrons carry charge and transfer energy through collisions with neighbouring electrons, converting electrical energy into other forms like light, heat, or motion.
| Characteristics | Values |
|---|---|
| Definition of electricity | Flow of electric charge |
| Charge carriers | Electrons |
| Flow of electrons | From negative terminal to positive terminal |
| Current | Flow of charge |
| Voltage | Electric potential that propels electrons |
| Electric field | Created by voltage, exerts force on electrons |
| Circuit | Closed path for electrons to flow |
| Series circuit | Current flows to each component in sequence |
| Parallel circuit | Multiple paths for current, components arranged side by side |
| Energy flow | Through electromagnetic field at the speed of light |
| Energy transformation | Electric energy converted to light, heat, motion, etc. |
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What You'll Learn
Electric current and charge
In a circuit, electric charge flows from the negative terminal of a power source, such as a battery, through the conductor, and back to the positive terminal. This movement of electrons creates an electric current. The circuit must be complete, with no gaps, for the current to flow. In a series circuit, components are arranged end-to-end, allowing the same current to flow through each component. In contrast, a parallel circuit provides multiple paths for the current, with components arranged side by side.
Electrons carry the charge and, as they move, they create an electromagnetic field. This field carries the energy around the circuit. The electrons transfer energy to neighbouring electrons through collisions, which explains the rapid energy flow compared to the slower drift velocity of individual electrons. When electrons pass through a bulb filament, for example, their collisions with the bulb's atoms cause excitation, resulting in the bulb lighting up.
To initiate the flow of electrons, a voltage or potential difference is applied across the conductor, creating an electric field. This electric field exerts a force on the free electrons, propelling them forward. Batteries, which are common energy sources, convert chemical energy into electrical energy, creating a voltage drop or electric field across the circuit. This electric field influences all electrons in the circuit, and when a switch is closed, it completes the circuit, allowing the electrons to flow simultaneously.
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Voltage and electric fields
Electric circuits are powered by the flow of electric charge, which, in most household contexts, means the movement of electrons through a conductor. These electrons move from areas of negative charge to areas of positive charge, creating an electric current. In conductive materials, such as metals, some electrons are free to move. These electrons are not bound to any particular atom and can drift from one atom to another.
Electric circuits require a source of electric potential, or voltage, which pushes electrons from a point of low potential energy to higher potential energy. Batteries are common energy sources that convert chemical energy to electrical energy. When you apply a voltage, or potential difference, across the conductor, it creates an electric field. This field exerts a force on the free electrons, propelling them through the conductor. This flow of electrons is what we refer to as electricity.
The electric field is defined as a vector field that associates to each point in space the force per unit of charge exerted on an infinitesimal test charge at rest at that point. In other words, an electric field is like a force field that surrounds an electric charge and can exert a force on another charge. The SI unit for the electric field is the volt per meter (V/m), which is equal to the newton per coulomb (N/C). The electric field is defined in terms of force, and force is a vector (having both magnitude and direction), so an electric field may be described by a vector field.
The electric field is stronger near charged objects and weaker farther away. The electric field doesn't depend on the electric potential but rather on how that potential changes with distance. The electric field acts between two charges similarly to the way that the gravitational field acts between two masses, as they both obey an inverse-square law with distance. This is the basis for Coulomb's law, which states that, for stationary charges, the electric field varies with the source charge and varies inversely with the square of the distance from the source.
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Series circuits
A series circuit is one of the two main types of electrical circuits, the other being a parallel circuit. In a series circuit, the components are arranged end-to-end, allowing the same current to flow through each component. To understand how a series circuit works, it's important to first understand how electricity flows.
Electricity is the flow of electric charge, which, in household contexts, means the movement of electrons through a conductor. These electrons move from areas of negative charge to areas of positive charge, creating an electric current. Conductive materials, such as metals, have free electrons that aren't bound to any particular atom and can move from one atom to another. When a voltage or potential difference is applied across the conductor, it creates an electric field that exerts a force on these free electrons, propelling them through the conductor.
In a series circuit, the total resistance is equal to the sum of the individual resistances. This means that the more resistors there are in a series, the more difficult it is for the current to flow. The total voltage of the circuit is also equal to the sum of the individual voltage drops across the resistors. If one component in a series circuit fails, the entire circuit breaks, and the current ceases to flow.
An example of a simple series circuit is a light bulb, a battery, a switch, and wire. When the switch is closed, the circuit is complete, and the battery's negative terminal repels electrons, sending them through the wire to the bulb. As a result, the bulb lights up, and the electrons continue flowing back to the battery's positive terminal.
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Parallel circuits
A parallel circuit is a type of electrical circuit that includes more than two separate paths for the flow of current. This is in contrast to a series circuit, where components are arranged end-to-end, allowing the same current to flow through each component.
In a parallel circuit, the components are arranged side by side, and the current can take multiple paths. This means that if one component fails, the current can still flow through the other paths, and the circuit remains intact. This can be imagined as several separate water pipes coming from the same source and going to the same destination.
The voltage in a parallel circuit is equal across all components, and the total voltage is equal to the voltage across the entire circuit. This is because there are only two sets of electrically common points in a parallel circuit, and the voltage between these common points must always be the same.
The total circuit current in a parallel circuit is equal to the sum of the individual branch currents. As the total current exits the positive terminal of the battery, it travels through the circuit, and some of the flow splits off to go through different branches, similar to a river branching into smaller streams. The combined flow rates of all the streams must equal the flow rate of the whole river.
Resistance in a parallel circuit is unique. Adding another path for the current to follow decreases the resistance and increases the current. The total resistance of a parallel circuit is always less than the lowest individual resistance.
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Energy transfer
In a circuit, the electric field affects all electrons, regardless of their position or potential. When a switch closes the circuit, electrons are subjected to the electric field, and they begin to flow simultaneously. This flow of electrons is what constitutes electricity.
The energy produced by this flow is significant, and it can be transformed into other forms, such as light, heat, or motion. For example, in a light bulb, the charges moving through the filament collide with the atoms, exciting them and causing the bulb to light up. This energy transformation from electrical to light energy occurs as the electrons pass through the bulb.
Additionally, the electric field created by the voltage source, such as a battery, plays a crucial role in energy transfer. The battery deposits energy per unit time into the surrounding electromagnetic field, and each section of the wire in the circuit draws energy from this field. This energy then propagates through the electromagnetic field as an oscillating wave, travelling at the speed of light. As a result, energy can reach the bulb even before the electromagnetic field fully develops throughout the circuit.
The movement of electrons in the wire also involves friction, leading to electrical resistance and the generation of heat. This heat is a form of energy transfer and can be observed as the wire heats up or, in extreme cases, melts.
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Frequently asked questions
Electricity is the flow of electric charge, which, in most household contexts, means the movement of electrons through a conductor.
A circuit is a closed loop that provides a path for electrons to continuously flow. It must have a power source, such as a battery, and the current flows through a conductor, such as a wire.
Electricity flows through a circuit board when a voltage or potential difference is applied across the conductor, creating an electric field. This field exerts a force on the free electrons, propelling them through the conductor. The circuit must lead from the negative charge source, through the conductor, and back to the positive charge source.
A simple example is a light bulb connected to a battery with a wire in between. When a switch is turned on, it closes the circuit, allowing electrons to flow from the negative terminal of the battery through the wire and light bulb, back to the positive terminal. The electrons flowing through the filament of the light bulb produce light and heat due to friction.
