Lesson 1, Topic 6
In Progress

# Electric Circuit – Components & Symbols

Lesson Progress
0% Complete

### Components that are commonly found in Electric Circuit:

An electric circuit usually comprises of the battery (cell) which is the source of electric energy, a key or switch to start or stop current flow, an ammeter to measure current, voltmeter to measure potential difference, a resistor and rheostat to vary the current.

These components are connected as shown in the image below;

Ammeter: An ammeter is used to measure the current flowing in a circuit. It has a small resistance. It is connected in series in the circuit so that the current it will measure should flow through it.

Voltmeter: A voltmeter is used to measure the voltage or potential difference across a component in a circuit. It has a large resistance. It is connected in parallel across the component whose voltage drop is to be determined. It takes in negligible amount of current.

Resistor: A resistor is an electrical component that opposes the flow of electric current through itself.

Galvanometer: A galvanometer is a device that is used to detect small electric current or measure its magnitude.

Cell: A cell pushes the electric current from the positive terminal round to the negative one. This is the way that conventional current flows.

Open key switch: The switch or key helps to make or break the circuit, i.e. switches on or switches off the current.

Rheostat: The rheostat is a variable resistor used to control electric current by increasing or decreasing the resistance manually.

error: