Electric circuit

Essay by sweeteli April 2004

download word file, 4 pages 4.3

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Aim: To design a simple electrical circuit for Doctor's Surgery to let people know when to enter and also to research and learn more about parallel and series circuits.


I am going to design an electric circuit for a Doctor's surgery.

There are two types of circuit's Parallel circuit, and Series circuit.

First I am going to explain what a circuit is and what the differences they have are.

An electric current is a flow of charge. The charges are given energy and made of flow using a cell or a battery. Charges can flow easily through connecting wire. The cell, wires, lamp and a switch, all these components are connected together and make a loop called a circuit.

Current will only flow through a component if there is a voltage across that component.

Voltage is the driving force that pushes the current round.

Parallel Circuit

In a parallel circuit you can add more components without the need for more voltage.

In a parallel circuit a failure of one component does not lead to the failure of the complete circuit, this is because a parallel circuit has more than on loop and all have to fail in more than one place before the other components fail.

Series Circuit

In series circuit (which I will be designing for the surgery) is a loop of wire with its ends connected to an energy source or a battery.

One end of the wire is connected to the positive terminal; the other end of the wire is connected to the negative terminal.

Series Circuit has all their components connected in a row on a loop of wire.

If one component in a series circuit fails, then all the other components in the circuit will fail. A series circuit has just one current...