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Physics · Class 10 · Chapter 16: Electricity

8 min

Key points

Electric current is the flow of electric charges through a conductor — measured in Amperes
Ohm's Law states that current through a conductor is directly proportional to voltage and inversely proportional to resistance
Resistance is the opposition to the flow of electric current — measured in Ohms (Ω)
Power is the rate of doing work or energy consumed per unit time — measured in Watts
Electric energy is the work done by electric current — measured in Joules or kWh
Series circuits have single path for current flow, parallel circuits have multiple paths
In series connection, current remains same but voltage divides
In parallel connection, voltage remains same but current divides
WAPDA generates electricity at Tarbela Dam and supplies to cities like Karachi through transmission lines

Definitions

Electric Current: Electric current is the amount of charge flowing through any cross-section of a conductor in unit time. I = Q/t
Potential Difference: The potential difference between two points is the work done in moving unit positive charge from one point to another. V = W/Q
Resistance: Resistance is the property of a conductor which opposes the flow of current through it. R = V/I
Electric Power: Electric power is the rate at which electrical energy is consumed or converted into other forms of energy. P = VI
Electromotive Force (EMF): EMF is the energy per unit charge supplied by a source like battery or generator. It is measured in volts.

Worked example

Define electric current and calculate the current flowing through a resistor of 10Ω when 5V potential difference is applied across it. (5 marks)

Electric current is the rate of flow of electric charge through a conductor. It is measured in amperes (A). Using Ohm's law: V = IR, where I = V/R. Given: V = 5V, R = 10Ω. Therefore: I = 5/10 = 0.5A

Common mistakes

Students confuse series and parallel connections — remember series has one path, parallel has multiple paths
Always write the formula before solving numerical problems
Students forget to convert units (mA to A, kΩ to Ω) before calculations
In parallel resistance formula, students forget to take reciprocal at the end
Students mix up current and voltage behavior in series vs parallel circuits

Quick recap

Electric current is rate of flow of charge (I = Q/t). Potential difference is work done per unit charge (V = W/Q). Ohm's law states V = IR for constant temperature. Electric power P = VI and electric energy E = Pt. Series circuits have same current, parallel circuits have same voltage.

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