Q1
What is electric current?
AThe flow of electric charge
BThe flow of magnetic field only
CA type of light
DA type of sound
SSCClass 8 (SSC)Science (सामान्य विज्ञान)Ch 4 · Topic 1
Current Electricity and Magnetism
Current electricity involves the flow of electric charge, and its relationship with magnetism forms the basis for many everyday electrical d
Core concept
Electric current is the flow of electric charge through a conductor, measured in amperes, driven by a potential difference (voltage).
How it works
A current-carrying conductor creates a magnetic field around it, a phenomenon called electromagnetism, discovered by Oersted.
Why it matters
This relationship is used in electromagnets, where current through a coiled wire creates a controllable magnetic field, often strengthened with an iron core.
Key detail
The connection between electricity and magnetism is fundamental to many devices, including electric motors, generators, and speakers.
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Quick notes
• Electric current: flow of charge, measured in amperes.
• Driven by potential difference (voltage).
• Current-carrying conductor creates magnetic field.
• This is electromagnetism, discovered by Oersted.
• Electromagnets: current through coiled wire.
• Iron core strengthens the magnetic field.
• This connection is used in motors, generators.
• Also used in speakers and other devices.