Grade 8 Science Unit 7 Measurements Associated with Electricity #education #science #electrcity

Grade 8 Science – Unit 7
“Measurements Associated with Electricity”

Based mainly on the Grade 8 Sri Lankan Science textbook and expanded with teacher-style explanations, practical examples, and learning support.

7.1 Electric Current
What is Electricity?

Electricity is one of the most important forms of energy used in daily life.

Examples:

Bulbs
Fans
TVs
Mobile chargers
Refrigerators
Computers

Electricity moves through wires in the form of electric charges.

What is Electric Current?
Definition

The flow of electrical charges through a closed circuit is called electric current.

Important Idea

Current flows only when:

The circuit is complete (closed)
There is a power source
Conducting wires are connected properly
Simple Electric Circuit
Main Parts of a Circuit
Dry cell / battery
Connecting wires
Bulb
Switch

When the switch is ON:

Current flows
Bulb lights up

When the switch is OFF:

Circuit breaks
Bulb goes off
Direction of Electric Current

The textbook explains that current direction changes when battery terminals are changed.

Conventional Current Direction

Current flows:

From the positive (+) terminal
To the negative (-) terminal
Effects of Changing Battery Terminals

When terminals are reversed:

Motor rotates in opposite direction
Ammeter needle moves opposite way

This proves:

Electric current has a direction
Measuring Electric Current
Symbol of Current

I

SI Unit

Ampere

Symbol

A

Small Units of Current
Milliampere

mA

Microampere

μA

Conversions

1000 mA=1 A

1000 μA=1 mA

Instrument Used to Measure Current
Ammeter

Used to measure electric current.

Important Rule

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