Comprehensive Study Notes for National Certificate in Electrical Power Engineering

A series of vocabulary flashcards based on key concepts in Electrical Power Engineering.

Electric Circuit

A closed loop through which electric current can flow.

SI Units

Standardized units used to measure physical quantities.

Current (I)

The flow of electric charge, measured in Amperes (A).

Voltage (V)

The electric potential difference, measured in Volts (V).

Resistance (R)

The opposition to current flow, measured in Ohms (Ω).

Power (P)

The rate at which work is done or energy is transferred, measured in Watts (W).

EMF (E)

The electromotive force, measured in Volts (V), represents the energy provided per charge.

Capacitance (C)

The ability of a capacitor to store charge, measured in Farads (F).

Magnetic Field Strength (H)

A measure of the magnetic force, expressed in A/m (Amperes per meter).

Chemical Effect of Electric Current

The process that occurs when electric current causes a chemical reaction.

Primary Cell

A type of battery that is not rechargeable, with irreversible chemical reactions.

Secondary Cell

A rechargeable battery that undergoes reversible chemical reactions.

Ohm's Law

The principle stating that voltage (V) equals current (I) times resistance (R).

Ammeter

An instrument used to measure electric current in a circuit.

Voltmeter

An instrument used to measure electric voltage or potential difference.

Inductance (L)

The property of a coil or circuit that opposes changes in current, measured in Henries (H).

Electromagnetic Induction

The process of generating electric current through a changing magnetic field.

Dielectric Strength

The maximum electric field a dielectric can withstand without breakdown.

Electric Flux Density (D)

The measurement of electric field strength per unit area, expressed in C/m².

Resistor Colour Coding

A method of indicating resistor values using colour bands.

Fuses

Safety devices that break the circuit when excessive current flows.

Energy Stored in a Capacitor

The energy held in a capacitor, calculated by E = 1/2 CV².