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Science / Electricity

Science / Electricity

Do you know what is common between an electric eel, a bolt of lightning, and a glowing bulb? It is electricity! An electric eel is a fish that makes its own electricity, Lightning is spark of electricity in the air and bulb uses electricity to glow. Electricity is a form of energy produced by charges. It is difficult to imagine our life without electricity.

An electric circuit is closed path in which current flows. It comprises of electric components (cell or battery, bulb, switch, resistors ). Learn to make different electrical circuits.

  • Circuit in series - The circuit which connects the components one after the other so that current is same through out the circuit.
  • Circuit in parallel - The circuit where components are divided into two or more than two branches, so that current is different in each branch, but voltage is same, is known as parallel circuit.

Relation between potential difference and current is given by Ohm's Law - " It states that the current flowing through a conductor at constant temperature is directly proportional to the potential difference across the conductor."
I ∝ V
I = V/R,  where R = constant

Learn to save electrical appliances from excessive current by using electric fuse. Current can rise due to following reasons :

  • Overloading ( too many higher power appliances turned on )
  • short circuiting ( live wire and neutral wire joined together )
  • fluctuation in voltage
Exercises
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Exercises
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  • Electricity - SmartTest

    Electricity

    • Accessed by: 570 Students
    • Average Time: 00:04:24
    • Average Score: 50.30
    • Questions: 84
    • Introduction to Electricity
    • Electric current and circuit
    • Electric Potential and Potential Difference
    • Circuit Diagrams
    • Ohm's Law
    • Factors on which the resistance of a conductor depends
    • Resistance Of A System Of Resistors
    • Heating Effect Of Electric Current
    • Electric Power
    • Review of Electricity
    • Electric charges

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