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Travel lighter with Apple's power adapter
On North American AC wiring, the neutral wire leads to the centre-tap on the step-down transformer that provides 240V (nominal) house current. From the centre-tap to either hot wire gives you 120V, 'cause it's right in the centre. (The centre-tap is also grounded, but only at the transformer. Current flowing on the neutral return wire will produce a voltage compared to ground in your house wiring. The exact voltage depends on the current and wire gauge.) |
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