Definition
A phrase used in aircraft electrical system descriptions to indicate that current is flowing through a specific component, circuit, or set of components. The phrase typically appears in technical writing about wiring, switches, relays, or protective devices to describe the active state in which electrons are moving through the conductor or device in question.
Plain English
It simply means electric current is flowing through the parts being described. The components are 'live' or carrying power at that moment.
Context Anchor
Seen in basic aircraft electrical-system explanations, especially when comparing materials that carry current with materials that block current.
Derivation
“Electricity” comes from the Greek word “elektron,” meaning amber; early experimenters noticed amber could produce electrical effects when rubbed. “Through” points to movement from one side or point to another, which fits the aviation meaning: current passing through a wire, switch, tool, or other material.
Why Pilots Care
Knowing whether current is flowing through a component helps pilots and technicians understand how a circuit behaves when switched on, when a breaker trips, or when a relay closes. It is the basic language used to describe a circuit doing its job.
Grounding Statement
If a material provides a complete path, current can pass through it; if the path is broken or blocked, current cannot pass through it.
Intuition Check
Do not think of electricity as simply sitting inside a part. In this context, the key idea is whether current can move through the part as part of a complete path.
Example Sentence 1
When the master switch is closed, the bus bars have electricity through them and power is available to the avionics.
Example Sentence 2
When troubleshooting a dead circuit, check whether the connectors still allow electricity through them.