electricity - a form of energy used to power lights, voltage - the force that pushes electricity through a wire, current - the flow of electric charge through a wire or circuit(the water pressure), resistance - the opposition to the flow of current, alternating current - electricity that changes direction, direct current - electricity that flows in one direction only, battery - a device that stores electrical energy, battery cell - a single unit inside a battery that produces electricity through a chemical reaction, battery pack - a group of connected batteries combined to deliver more power, battery handling - the correct way to maintain a battery, aircraft battery - a special battery used in aircraft to start engines when the main power is off, circuit - a complete path that electricity flows through, circuit breaker - switch that automatically turns off the power if too much current flows, fuse - small safety device that breaks the circuit if too much current flows, wiring - system that carries electricity to different parts using wires, conductor - a material that lets electricity flow easily (copper or aluminum), insulator - a material that lets electricity flow easily, ammeter - a tool that measures the electric current in a circuit (how many amps) circuit, ohmmeter - a tool that measures electrical resistance in a circuit ( how many ohms), voltmeter - a tool that measures the electrical pressure in a circuit ( how many volts), avionics - electronic systems used in aircraft for communication, navigation and control, software - programs and instructions that tell the computer what to do, memory - part of the computer that stores data and instructions, CPU (central processing unit) - the main chip in the computer that processes all the data, compass - a simple tool that shows direction north - south - east - west, radar - a system that uses radio waves to detect objects, receiver - a device that gets signals from other radios, reception - how clear and strong the received signal is, lead acid battery - made of lead plates and acid used for starter motors and lights, nickel cadmium battery - made of nickel and cadmium metals,

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