Electricity Mind Map

Electric current is the rate at which electric charge flows through a conductor.

Always write the unit as ampere and use I = Q/t in numerical questions.

Potential difference is the work done per unit charge between two points in a circuit.

Remember that voltage is always between two points, not at a single point alone.

Ohm's law states that at constant temperature, the current through a conductor is directly proportional to the potential difference across it.

Always check that the question says constant temperature before using the law directly.

Resistance is the opposition offered by a conductor to the flow of electric current.

Remember: longer wire means more resistance, and thicker wire means less resistance.

In a series combination, components are connected end to end in a single path for current.

Remember one path, same current, and added resistance in series circuits.

In a parallel combination, components are connected in separate branches across the same two points.

Remember parallel means many paths and the same voltage across each branch.

The heating effect of electric current is the production of heat when current passes through a conductor with resistance.

Use the square of current carefully in numericals because it changes the answer fast.

Electric power is the rate at which electrical energy is used or converted in a circuit.

Always write power in watt and use the correct relation based on the values given.

The commercial unit of electrical energy is kilowatt-hour, written as kWh.

Convert power and time carefully before finding units consumed in billing questions.

A fuse is a safety device connected in a circuit to protect it from excessive current.

Always mention series connection, live wire, and melting due to excess current in answers.