i m studying cathode ray currently, but i was confised with the(adsbygoogle = window.adsbygoogle || []).push({});

idea of voltage and current flow

i recalled that voltage is a potential difference in a circuit, which allow current flow. but as i reseach on the interent there is some site talking about negative or positve volatge???????

2. i remmber that when a voltage applied, a current will flow from positive to negative

but how come cathode ray is the opposite?

thanks

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# Need help with voltage and current~

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