b) electric current

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4 Terms

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  • explain what is meant by electric current in metals

  • electric current is the movement of electrons in metals

    • most electrons in metals are fixed to their atoms, but some are free to move

    • metals are structured as a lattice of positive ions surrounded by delocalised electrons

2
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  • explain what is meant by electric current in electrolytes

  • it is also the movement of ions in electrolytes

    • electrolytes are molten or aqueous ionic solutions

    • the electrolyte separates into positive and negative ions, which are attracted to the cathode and anode

3
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  • explain what is meant by conventional current

  • conventional current represents electric current as travelling from the positive to the negative terminal

    • electric current in metals always travels from the negative to the positive terminal, opposite to the conventional current

    • electric current in electrolytes can travel from the negative to the positive or from the positive to the negative terminal, either in the same direction or opposite to the conventional current

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