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Electrical Circuits
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Slide 1

S.MORRIS 2006

S.MORRIS 2006

ELECTRICAL CIRCUITS

Slide 2

The Cell

The Cell

The cell stores chemical energy and transfers it to electrical energy when a circuit is connected.

When two or more cells are connected together we call this a Battery.

The cells chemical energy is used up pushing a current round a circuit.

Slide 3

What is an electric current?

What is an electric current?

An electric current is a flow of microscopic particles called electrons flowing through wires and components.

+

-

In which direction does the current flow?

from the Negative terminal to the Positive terminal of a cell.

Slide 4

Simple circuits

Simple circuits

Here is a simple electric circuit. It has a cell, a lamp and a switch.

To make the circuit, these components are connected together with metal connecting wires.

cell

lamp

switch

wires

Slide 5

simple circuits

simple circuits

When the switch is closed, the lamp lights up. This is because there is a continuous path of metal for the electric current to flow around.

If there were any breaks in the circuit, the current could not flow.

Slide 6

Circuit diagram

Circuit diagram

cell

switch

lamp

wires

Scientists usually draw electric circuits using symbols;

Slide 7

circuit diagrams

circuit diagrams

In circuit diagrams components are represented by the following symbols;

cell

battery

switch

lamp

motor

ammeter

voltmeter

buzzer

resistor

variable resistor

Slide 8

Types of circuit

Types of circuit

There are two types of electrical circuits;

SERIES CIRCUITS

PARALLEL CIRCUITS

Slide 9

Series circuits

Series circuits

The components are connected end-to-end, one after the other.

They make a simple loop for the current to flow round.

If one bulb blows it breaks the whole circuit and all the bulbs go out.

Slide 10

Parallel circuits

Parallel circuits

The current has a choice of routes.

The components are connected side by side.

If one bulb blows there is still be a complete circuit to the other bulb so it stays alight.

Slide 11

Measuring current

Measuring current

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