Molly Ayala
A closed circuit is an electric circuit that provides an uninterrupted, endless path for the flow of electric current. In other words, it is a closed-loop path that allows electric current (charged particles) to pass from an active energy source to the connected load or other components. Conductive materials or conductors (like copper) are needed to create a path for the electric current to flow. A closed switch in a circuit allows the current to pass through, while an open switch will not as it breaks the continuity.
| Characteristics | Values |
|---|---|
| Definition | An electric circuit providing an uninterrupted, endless path for the flow of current |
| Current | Flows in an uninterrupted path |
| Conductors | Requires conducting materials or conductors (e.g. copper) |
| Voltage | Requires an active voltage source device (e.g. a battery) |
| Switch | A closed switch allows current to pass through |
| Electrons | Electrons flow from the negative terminal of the battery to the positive terminal |
| Electric Field | Influences the entire circuit instantly |
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What You'll Learn
Closed-loop path
A closed-loop path, or closed circuit, is an electric circuit that provides an uninterrupted and endless path for the flow of electric current. It allows electrical energy (electrons) to flow and move without any interruptions to stop the flow of power.
In a closed circuit, electric current (charged particles) passes from an active energy source to the connected load or other components. This requires conducting materials or conductors (like copper), an active voltage source device (like a battery), and a full path or circuit to flow the electric current.
The closed-loop path can be compared to a road that crosses a river via a bridge. The bridge allows a car to move down a road, over a waterway, and return to the other side. Similarly, a closed circuit enables electrons to flow and move in a continuous path.
When a switch is closed, the circuit is complete and the current can flow. This is referred to as a closed switch in circuit terminology. A closed switch allows continuity for the current to pass through, while an open switch breaks continuity and does not allow current to pass.
In a closed circuit, electrons can flow from the negative terminal of the battery to the positive terminal, influenced by an electric field. The electric field can impact the entire circuit almost instantly, while the electrons themselves move slowly. As a result, the electrons in the circuit begin to flow simultaneously, and the charges closest to the light bulb will start converting energy from electrical to light or heat.
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Conducting materials
A closed circuit is a continuous and uninterrupted pathway for electric current to flow. It is a loop that starts and ends at an active energy source, such as a battery. Conducting materials, also known as conductors, are essential in forming a closed circuit. These materials allow the electricity to flow, acting as a pathway for the current.
In a closed circuit, conducting materials are used to connect the various components, such as resistors or lamps, to the power source. The conducting materials create a pathway for the electric current to flow, allowing it to move freely and uninterrupted. This is in contrast to an open circuit, where there is a break in the pathway, preventing the flow of current.
When a circuit is composed entirely of conducting materials, it is considered a closed circuit. This is because the current can flow freely without any interruptions in the path. The conducting materials ensure that the circuit is complete and allow the connected devices to be powered.
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Active voltage source
A closed circuit is a continuous and uninterrupted path that allows electric current to flow. Conductive materials, an active voltage source, and a complete path are required for the current to flow in a closed circuit.
An active voltage source is a critical component of a closed circuit. It is an active element that provides a constant and specified voltage independently of any other circuit elements. In other words, it is capable of continuously supplying energy to a circuit. Active voltage sources include batteries, generators, and operational amplifiers.
Voltage sources are two-terminal devices that maintain a fixed voltage drop across their terminals. They can be categorized as either ideal or real voltage sources. Ideal voltage sources have zero internal resistance and can supply or absorb any amount of current. They are often used as mathematical abstractions to simplify the analysis of real electric circuits.
In contrast, real-world voltage sources have a very low but non-zero internal resistance, which reduces their terminal voltage as they supply higher load currents. The internal resistance of a real voltage source affects its ability to supply unlimited current. No real voltage source is ideal, and all experience a decrease in terminal voltage with an increase in load current.
It is important to note that voltage sources can be connected in series or parallel. When connected in series, voltage sources of different values can be combined to form a single voltage source. In contrast, when connecting ideal voltage sources in parallel, it is crucial to ensure they have the same voltage values to avoid logical inconsistencies.
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Flow of electric current
A closed circuit is a continuous and uninterrupted path that allows electric current to flow. This current is made up of charged particles, usually in the form of electrons with a negative charge. These electrons are loosely bound to atoms in conductive materials, and they can be induced to move in a uniform direction with little effort.
To facilitate the flow of electric current in a closed circuit, certain components are necessary. Firstly, a conducting material or conductor, such as copper, is required to provide a pathway for the electrons. Secondly, an active voltage source device, such as a battery, is needed to provide a potential difference and drive the electrons forward. Batteries, which are commonly used as energy sources, have two terminals: one with more negative charges than positive, and the other with all positive charges. When connected to a wire made of conductive copper atoms, the negative-charged electrons in the copper atoms will be influenced by the electric field and start to move.
The conventional direction of current flow is considered to be from the positive terminal to the negative terminal of the power source. This convention was established before the discovery of electrons and their negative charge and is maintained for consistency in scientific and engineering practices. However, it's important to note that electrons physically move in the opposite direction, from the negative to the positive terminal. This discrepancy is due to the historical definition of conventional current direction, which was arbitrarily defined as the direction of positive charge flow.
The flow of electric current can be influenced by various factors and components within the circuit. For example, a resistor can reduce the current flow by converting some of the electrical energy into heat energy. Additionally, in alternating current (AC) systems, the movement of electric charge periodically reverses direction, while in direct current (DC) systems, the charge moves in only one direction, known as unidirectional flow.
Overall, the closed circuit provides an uninterrupted pathway for the flow of electric current, allowing electrons to move continuously and power various devices and systems.
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Switches and terminals
A closed circuit allows current to flow without interruptions. To complete a closed circuit, you need conducting materials or conductors (like copper), an active voltage source device (like a battery), and a full path or circuit to flow the electric current.
Switches are an integral part of a closed circuit. They can be manually or automatically operated electromechanical devices with one or more sets of electrical contacts, which are connected to external circuits. Each set of contacts can be in one of two states: "closed" or "open". When a switch is closed, the electrical contacts are touching, and electricity can flow between them. When the switch is open, the contacts are separated, and the switch is non-conducting.
The most common example of a switch is a simple light switch, which opens and closes the circuit that connects a light to a power source. When the switch is closed, the circuit is complete, and electrons can flow from the negative terminal of the battery to the positive terminal via the lightbulb. The electric field influences the entire circuit almost instantly, and the electrons in the circuit begin to flow simultaneously.
There are various types of switches, including push-button switches, toggle switches, rocker switches, slide switches, and tactile switches. Push-button switches can be "normally open" (NO) or "normally closed" (NC). NO switches are used when the circuit needs to be closed when the switch is activated, and NC switches are used when the circuit needs to be open when the switch is activated. For example, a push-button switch is NO, and a safety switch is NC.
In addition to switches, terminals are another important component of a closed circuit. A battery, for instance, has two terminals: one with more negative charges than positive, and the other with all positive charges. When a wire full of conductive copper atoms is connected to the battery, the negative-charged free electrons in the copper atoms will be influenced by the electric field.
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Frequently asked questions
A closed circuit is an electric circuit that provides an uninterrupted, endless path for the flow of current. It is similar to a road that crosses a river via a bridge, allowing a car to move down a road, over a waterway, and return to the other side.
To create a closed circuit, you need conducting materials or conductors (like copper), an active voltage source device (like a battery), and a full path or circuit to flow the electric current.
A closed circuit allows electrical energy (electrons) to flow and move. When the circuit is closed, electrons can flow from the negative terminal of the battery to the positive terminal. The electric field influences the entire circuit practically instantly, while the electrons move slowly.
