D.C. Circuits

Circuit Symbols Circuit diagrams use standardised symbols to represent electrical components. You must be able to recognise, draw, and use all symbols listed in…

Kirchhoff's First Law (Junction Rule) Kirchhoff's First Law The algebraic sum of the currents at a junction is zero. Equivalently: The sum of currents entering…

The Potential Divider Principle A potential divider is a circuit that uses two or more resistors in series to divide an input voltage into smaller output…

Electromotive Force (e.m.f.) Electromotive Force (e.m.f.) The energy transferred per unit charge by a source in driving charge around a complete circuit. =…

The Potentiometer A potentiometer is a device used to measure or compare potential differences with high accuracy. It works on the principle of a potential…