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## Physics / Current Electricity

### Physics / Current 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 α V where R = constant
I = V/R
Electro-motive force (e.m.f) (ε)- when no current is drawn from cell i.e. when the cell is in open circuit ,the potential difference between terminals of cell is emf. Terminal voltage(V) - When current is drawn from a cell i.e. when the cell is in closed circuit, the potential difference between electrodes of the cell is called its terminal voltage. Relation between e.m.f, terminal voltage and internal resistance
r = \frac{\epsilon}{V} - 1 \times R
Understand the heating effect of electric current and relation H = I2Rt
Learn how electricity reaches your homes and how wiring is done in houses by tree system and the ring system.      Exercises
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• ### Current Electricity - SmartTest

A SmartTest on Current Electricity

• Accessed by: 435 Students
• Average Time: 00:08:17
• Average Score: 60.22
• Questions: 75
• Introduction to current electricity
• Concept of current
• Concept of potential and potential difference
• Concept of resistance
• Ohm's law and experimental verification of Ohm's law
• Ohmic and non ohmic resistors
• Specific resistance or resistivity
• Electro-motive force, terminal voltage and internal resistance of a cell
• Combination of resistors in series
• Combination of resistors in parallel
• Current electricity review