Highlights:

Explains electrical current as electron flow in circuits.
Distinguishes between conventional current and electron flow.
Describes AC and DC current types and their applications.
Details how current is measured and the importance of safety devices.
Illustrates current behavior in series and parallel circuits with resistors and lamps.
Discusses fuses, circuit breakers, and ground fault devices for circuit protection.

Key Concepts

Electrical current is the flow of electrons in a circuit.
Copper is a common conductor due to free electrons in its valence shell.
Voltage is the pushing force that drives electron flow, analogous to water pressure.
Current is measured in amperes (amps), representing Coulombs of charge per second.
Conventional current flows from positive to negative terminal; electron flow is opposite.
AC (Alternating Current) electrons alternate direction; DC (Direct Current) electrons flow one way.
Series circuits have the same current throughout; parallel circuits split current among branches.
Resistors add resistance, reducing current flow and causing voltage drops.
Fuses and circuit breakers protect circuits by breaking the circuit if current exceeds safe limits.
Ground Fault Circuit Interrupters (GFCI) or Residual Current Devices (RCD) detect leakage currents to prevent electric shocks.

Electrical current is electron flow driven by voltage.
Copper is a good conductor, silver is the best conductor; rubber is an insulator.
Conventional current flows positive to negative; electrons flow opposite.
AC current alternates direction; DC current flows one way.
Series circuits have equal current; parallel circuits split current.
Resistors reduce current and cause voltage drops.
Fuses and circuit breakers protect circuits from excess current.
GFCI/RCD devices prevent electric shocks by detecting leakage.
Multimeters are essential tools for measuring current and voltage.