Q1
What does Ohm's law state?
AV = IR
BV = I+R
CV = I/R
DV = I-R
ICSEClass 10 (ICSE)PhysicsCh 8 · Topic 1
Current Electricity
Current electricity involves the flow of electric charge, following Ohm's law, and understanding resistance in series and parallel combinati
Core concept
Ohm's law states that current through a conductor is directly proportional to voltage, provided temperature remains constant: V = IR.
How it works
Resistance depends on the resistor's length, cross-sectional area, and material, calculated as R = ρL/A, where ρ is resistivity.
Why it matters
In series combination, resistances add directly (R = R₁+R₂+...), while in parallel combination, reciprocals add (1/R = 1/R₁+1/R₂+...).
Key detail
Electrical power is calculated as P = VI = I²R = V²/R, and electrical energy consumed is power multiplied by time, important for calculating electricity bills.
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Quick notes
• Ohm's law: V = IR (constant temperature).
• Resistance: R = ρL/A.
• ρ is resistivity; L is length; A is area.
• Series resistances add directly.
• Parallel: reciprocals add (1/R = 1/R₁+1/R₂).
• Power: P = VI = I²R = V²/R.
• Energy = power × time.
• This is used for electricity bill calculations.