Trystan Casey
Electric circuits are an essential part of our daily lives, from the lights in our homes to the devices we use. In Class 6, students learn about the basics of electric circuits, including their components and how they function. A simple electric circuit consists of a cell, a bulb, and connecting wires, with the electric cell containing both positive and negative terminals. When a bulb and wire form a complete path from one terminal of an electric cell to the other, it is known as a closed circuit, and the bulb lights up. On the other hand, an open circuit has a gap in the path, causing the bulb to remain unlit. Understanding these fundamental concepts of electric circuits helps us comprehend the invisible force that powers our technology.
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Closed circuits
A closed circuit is a continuous and closed path through which electric current flows. It contains a complete path between the positive and negative terminals of cells, allowing electric current to pass from one terminal to another. This means that the circuit is complete and the electric current can flow through it. In a closed circuit, the bulb lights up because it forms a complete path with the wire, starting at one terminal of the electric cell and ending at the other. The electric current flows from the positive terminal of the electric cell to its negative terminal.
In a closed circuit, the current enters the bulb through one of its terminals, flows through the filament inside, and exits through the other terminal. The filament glows when the current passes through it. If the filament of the bulb is broken, the circuit is interrupted, and the current cannot flow, resulting in the bulb not lighting up.
A simple circuit consists of basic electrical components such as a cell, key, bulb, and connecting wires. When two or more bulbs are connected in a series within a circuit, it is known as a series circuit. In this configuration, the current remains the same in all the elements, and if any one element is damaged or disconnected, the entire circuit will cease to function.
In contrast, a parallel circuit is formed when two or more bulbs are connected in parallel, providing multiple paths for the current to flow through.
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Open circuits
An electric circuit is a closed-loop that forms a network of electrical components, allowing the flow of electric current from the source to the load. The source is the point from which the electron starts flowing, and the point where electrons leave the electrical circuit is called the return.
An open circuit is when the continuity of the circuit is broken, creating a discontinuous path that restricts the flow of electricity from the source to the load. In other words, an open circuit is when the path has been broken or "opened" at some point, preventing current from flowing. An open circuit is also known as an incomplete circuit.
An open circuit might be either intentional or unintentional. An example of an intentionally open circuit is the circuit to a room's lights being turned off. The switch is in the "off" position, which opens the path via which power would ordinarily flow, and there is no closed path available for energy to flow to the lights.
Unintentionally, an open circuit may be produced by forgetting to attach a battery or having a wire break anywhere in the circuit. For instance, when using a solderless breadboard to design a circuit, accidentally inserting one side of a component into the wrong hole will leave that component disconnected and generate an open circuit.
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Electric cells
The electric cell consists of an electrolyte and two electrodes. The electrolyte is typically a solution of water and solvent containing dissolved ions, such as sodium chloride. The electrodes are made of different metals and are immersed in separate electrolyte solutions. The ions are attracted to the electrode of the opposite charge, resulting in chemical reactions (redox reactions) that produce an electric current.
The maximum potential difference between the two electrodes is called the electromotive force (EMF) or the emf of the cell. It represents the energy per unit charge. The unit of EMF is the volt. When a cell is connected to an external circuit (closed circuit), the measured potential difference across the terminals will be less than the actual EMF due to internal resistance.
When two or more electric cells are joined together, they form a battery. Cells and batteries come in various shapes and sizes depending on their intended use. A simple circuit consists of basic electrical elements like a cell, key, bulb, and connecting wires.
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Electric switches
An electric switch can be in one of two states: ON or OFF. When the switch is ON, it acts like an open door in the circuit, allowing the electric current to flow through the circuit. Conversely, when the switch is OFF, it acts like a closed door, blocking the flow of electric current. This mechanism helps control the flow of electricity and determine whether a device connected to the circuit receives power or not. For example, if a lamp is connected to a circuit with a switch, turning the switch ON will allow the electric current to flow, illuminating the lamp. Conversely, turning the switch OFF will interrupt the current, turning off the lamp.
The function of an electric switch can be demonstrated through a simple experiment. This experiment involves creating a basic electric circuit using a wooden plank or thermocol sheet as a base. Two drawing pins, labelled A and B, are inserted into the surface, with a safety pin acting as a switch placed between them. When the safety pin is not touching pin A, the circuit is open, and electricity cannot flow through, causing any connected bulb to remain unlit. However, when the safety pin is touched to pin A, it closes the circuit, enabling the flow of electricity and illuminating the bulb.
In a closed circuit, electric current flows in a particular direction, from the positive terminal to the negative terminal of the electric cell. The electric cell provides the energy required to move electric charges around the circuit. A closed circuit ensures a continuous pathway for the current, allowing it to flow from one terminal to another. On the other hand, an open circuit has a gap between the terminals, disrupting the flow of electricity and preventing devices from functioning.
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Electric bulbs
An electric bulb is a simple light source that uses a wire filament to glow when electricity is applied. The filament is enclosed in a glass mount, usually in the shape of a globe, and is connected with copper and lead wires to the lamp's base. The wires and the filament are enclosed in a glass bulb, which is filled with an inert gas, such as argon. Argon gas is used because, as an inactive gas, it protects the filament from burning and increases its lifetime.
The base of the bulb holds it upright and connects it to the electric circuit. The electricity passes from the base to the filament through the copper and lead wires, causing the filament to emit light and glow. The filament is heated to glowing white-hot, causing the current to become incandescent and emit light.
The bulb is one of the simplest electrical elements and is a key component of a simple circuit. A simple circuit consists of a cell, key, bulb, and connecting wires. The bulb is connected to the electric cell or battery, and the circuit is complete when the path from one terminal of the electric cell to the other is finished, causing an electric current to flow through the circuit and the bulb to light up.
The base of the bulb has two terminals, which are fixed so they do not touch each other. One is connected to the metal casing around the base, and the other is connected to the metal tip of the base. When the current enters the bulb, it passes through one of these terminals and flows out through the other, passing through the filament inside the bulb and causing it to glow. If the filament is broken, the circuit is not completed, and the current cannot flow, so the bulb does not light up.
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Frequently asked questions
An electric circuit is a path along which electricity can flow. A simple electric circuit consists of a cell, torch bulb and two connecting wires.
A closed circuit is when there is a complete path between the positive and negative terminals of cells, allowing electric current to pass from one terminal to another.
An open circuit is when there is a gap in the connections between the terminals of the cell, wires and the bulb, etc. Electricity does not flow through an open circuit.
A switch is a simple device that breaks or completes a circuit. It works by opening and closing a gap in an electric circuit.
