# What is the source of electricity in an electric circuit?

In an electric circuit, the source of power is a battery. As long as the battery has energy, it can keep lighting lamps or electric devices. When the battery needs to be recharged, it will release all its energy into another battery or into an external charger.

Electric circuits contain wires that transmit electrical current from one place to another. Wires used for this purpose are called "conductors". Other materials used in electric circuits include: insulators (which prevent electrons from flowing through them); and resistors (which limit current flow). Electric circuits also include other components such as capacitors (which store electrical charge), inductors (which store magnetic flux in a conductor), and transistors (which control current flow).

Conductors are usually made from copper or aluminum metal strands wrapped around plastic cores. These strands are then twisted together to form a wire. Some wires inside electric circuits are very thick; others are very thin. The number of wires needed in a circuit depends on the size of the circuit and how much current it must carry.

The term "circuit" is also used to describe any group of wires that connect two or more points together.

## What part of an electric circuit is a battery?

The battery is the charge pump in an electric circuit, pumping charge through the battery from a low electric potential energy location (the "-terminal") to a high electric potential energy position (the "+ terminal").

Batteries can be divided into two main categories based on their use: rechargeable batteries and non-rechargeable batteries. Batteries used in cell phones, iPods, and other portable electronic devices are usually non-rechargeable because overcharging them would cause them to leak or explode. Batteries for your home electronics (such as power tools) may be rechargeable because they can be recharged multiple times before they need to be replaced.

Electric circuits containing batteries must provide some way to disconnect the battery from the circuit if excessive voltage is applied to it. This is normally done with a "battery switch" that closes when there is too much voltage across the battery and opens when there is not enough voltage across it to do any damage. Switches can be anything that breaks the circuit, such as a mechanical switch or a semiconductor switch like a transistor. A mechanical switch requires contact points that can either be closed or opened by physical action (for example, a set of contacts mounted on a shaft that can be moved into or out of alignment).

## What is the source of electricity for a simple electric circuit?

A basic electric circuit can be made up of a battery (or other energy source), a light bulb (or other energy-consuming device), and conducting wires connecting the two terminals of the battery to the two ends of the light bulb. Electricity from the battery flows through the wire into the light bulb, where it is converted into heat energy and emitted as light.

The simplest type of electric circuit is called a "circuit loop". A circuit loop consists of a single path for current to flow from a power source through a light bulb and back to the power source again. A circuit loop cannot have more than one component connected to it at a time: either the battery or the light bulb must be disconnected when another component is added to the circuit.

All electrical components have an internal resistance that causes them to draw some amount of current even when they are not being used as part of the light bulb circuit. This current flow through the component generates heat, which could damage the component if it is not removed. All electric circuits need some form of resistance to prevent excessive current flow and avoid burning out the light bulb too quickly. The typical household circuit uses light bulbs with a filament that gives off light when heated by current flowing through it. The filaments of all but the most expensive lamps require continuous current to keep them warm enough to emit light; this is why your lights go out when you turn off the wall switch.

## What are the three things needed to make an electric circuit?

A source of electric energy, a load or equipment that utilizes the electric energy, and wires are the three components of any electric circuit. An electric energy source might be a battery or a wall outlet. A load might be a light bulb, an appliance, or another type of electric equipment. The source and the load are linked by wires. These links are called circuits.

In general, all electrical circuits can be divided into two broad categories: simple circuits and complex circuits. A simple circuit is one in which only two elements are connected together. A typical simple circuit would be a lamp attached to a power supply via a switch. Because only two elements are involved, the circuit can be described as having only one "turning point." That is, there is only one place where the path from source to load may be interrupted. A complex circuit is one in which more than two elements are connected together. A simple example of a complex circuit is a kitchen refrigerator. There are many different types of complex circuits, but they all share this characteristic: there are several possible paths from source to load. For example, a circuit may connect one power supply terminal to one light bulb and to another light bulb connected to a second power supply terminal. This circuit has two paths from source to load, but it is not difficult to construct because there are no positive or negative loops (i.e., directions for current to travel) involved. Any circuit with three or more connections is considered complex.

## What is a circuit in electricity?

An electric circuit consists of a device that provides energy to the charged particles that make up current, such as a battery or a generator, as well as equipment that consume current, such as lights, electric motors, or computers, and the connecting wires or transmission lines. The devices that provide energy and the consuming equipment each have their own set of circuits. For example, a light bulb has its own circuit within the body of a lamp, which connects it to power when the lamp is plugged in. A radio has its own circuit within your home, which connects it to the house wiring when the radio is turned on.

Every component in an electrical system is connected directly or indirectly to all other components. A connection may be made by using wires, but even parts that are not physically connected can be linked by generators, for example, where one part of the system produces enough power for another part which is not connected to it. This allows different parts of the system to work together efficiently.

In an electric circuit, also known as a loop, any two points can be connected by at least one path. There may be many paths between any two points, but at least one path exists. A circuit is closed when you reach a conclusion about something that has yet to happen. For example, if you turn off the main switch for your house then all the circuits will be broken except for those things that are always on like the lights and the refrigerator.

## What is the source of energy in a circuit?

A circuit is a closed loop through which electrons can pass. The electrical energy in the circuit is supplied by a power source, such as a battery. No electrons will travel unless the circuit is complete, that is, it makes a full circle back to the electrical source. Once the circuit is complete, electrons flow from the source through one part of the circuit, then another part, and so on, until they return to the beginning point. The entire process takes place within the limits set by the voltage of the source.

The electron flow causes some parts of the circuit to become electrically "hot" while others remain at room temperature. For example, when you touch two wires of an electric light bulb, the tip of your finger becomes hot because it is in contact with electricity. The other part of your finger remains at room temperature because it is not in contact with any wires. Electricity travels in continuous loops inside circuits, so every part of a circuit contains these loops. A "hot" part of the circuit is just one that has been exposed to a higher voltage than the other parts; the heat comes from the breaking down of the insulation around these wires as a result of this higher voltage.

In general, anything that allows electrons to flow is called a circuit or a path for current. This includes cables, wiring, metal plates, and solid objects such as nails and screws.

##### Roger Amaral

Roger Amaral is the kind of person who will stop and ask if he can help you with something. He's very knowledgable about all kinds of things, from electronics to history to geography to religion. He loves learning new things, and is always looking for ways to improve himself.

#### Disclaimer

EsWick.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.