Learn about direct current (d.c.) and its sources, including cells used in everyday devices. Understand how current flows from the positive terminal to the negative terminal, and how direct current is defined. Explore the concept of direct current and its applications.

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Questions and Answers

Which part of a cell does the current flow from?

Positive terminal to negative terminal

What happens when a cell gets discharged?

It stops giving current and becomes useless

What is the main difference between primary cells and secondary cells?

Primary cells can't be recharged, secondary cells can be recharged

How is direct current (d.c.) defined?

Current of constant magnitude flowing in one direction Signup and view all the answers

What happens in a primary cell after all the chemical energy has been converted into electrical energy?

They are discarded after use Signup and view all the answers

What do the conducting rods in a cell called electrodes do?

Facilitate chemical reactions within the cell Signup and view all the answers

What role does the electrolyte play in a cell?

It conducts electricity between the electrodes Signup and view all the answers

Why are primary cells considered 'use and throw' type of cells?

Because they are discarded after use when all chemical energy is converted into electrical energy Signup and view all the answers

In a dry cell, what does the zinc case act as?

Negative terminal Signup and view all the answers

What kind of current does a dry cell provide?

Direct current Signup and view all the answers

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Study Notes

Direct current (d.c.) flows from the positive terminal of a cell to its negative terminal through a bulb, lighting it up.
A cell provides direct current of constant magnitude flowing in one direction until it gets discharged and becomes useless.
A dry cell consists of conducting rods (electrodes) immersed in an electrolyte, with the zinc case acting as the negative terminal and a cap projecting as the positive terminal.
Cells are classified as primary cells (irreversible chemical reaction, disposable after use) and secondary cells or accumulators (rechargeable).
Primary cells are discarded after use when all the chemical energy is converted into electrical energy.