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Electrical System - Coggle Diagram
Electrical System
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Batteries
Must be arranged CORRECTLY (Negative to Positive, Positive to Negative)
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Has 2 terminals, Positive and Negative.
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Wire
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Must be connected to four things: Metal casing, Metal tip, Positive terminal of battery and Negative terminal of battery.
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Bulb arrangements
Parallel 
Same number of batteries, but two bulbs light up at the same voltage.
Series
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