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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