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Why is Polarity Important?

Polarity is important because electricity flows in one direction, from the

positive (+) side to the negative (-) side of the battery. If we connect
the battery the wrong way (reverse polarity), the device may not work

properly or could get damaged.

How to Identify Battery Polarity?

To iderntify battery's polarity, there are two signs at both the

ends of a battery called its terminal.

Positive (+) Terminal: Usually has a plus sign on it or is slightly

raised.

Negative (-) Terminal: Usually has a minus sign on it or is flat.

Always make sure you connect the positive end to the positive side of the

device and the negative end to the negative side to make sure it works
correctly.

Introduction to Close Circuit and Open Circuit

An open circuit is when there is a break in the path that electricity needs

to flow through. It means that the electricity cannot travel because the
path is not complete.

Working Principle

An open circuit works on the following principle:

• In an open circuit, something is disconnected (like a switch

is off or a wire is broken), so electricity stops flowing.

• No power can reach the device, so the device won’t work.

Example

Think of a flashlight. When the switch is off,

the circuit is open, and the light doesn’t turn
on because the electricity cannot reach the

bulb.

Understanding the Circuits 29